diff --git a/app/controllers/getting_started_controller.rb b/app/controllers/getting_started_controller.rb
index e99b07c79..3dc56d4d6 100644
--- a/app/controllers/getting_started_controller.rb
+++ b/app/controllers/getting_started_controller.rb
@@ -193,415 +193,11 @@ curl http://localhost/api/v1/getting_started -v -u #{login}:#{password}
     # check admin permissions
     return if deny_if_not_role(Z_ROLENAME_ADMIN)
 
-    # validation
-    user   = nil
-    domain = nil
-    if params[:email] =~ /^(.+?)@(.+?)$/
-      user   = $1
-      domain = $2
-    end
-
-    if !user || !domain
-      render json: {
-        result: 'invalid',
-        messages: {
-          email: 'Invalid email.'
-        },
-      }
-      return
-    end
-
-    # check domain based attributes
-    provider_map = {
-      google: {
-        domain: 'gmail.com|googlemail.com|gmail.de',
-        inbound: {
-          adapter: 'imap',
-          options: {
-            host: 'imap.gmail.com',
-            port: '993',
-            ssl: true,
-            user: params[:email],
-            password: params[:password],
-          },
-        },
-        outbound: {
-          adapter: 'smtp',
-          options: {
-            host: 'smtp.gmail.com',
-            port: '25',
-            start_tls: true,
-            user: params[:email],
-            password: params[:password],
-          }
-        },
-      },
-      microsoft: {
-        domain: 'outlook.com|hotmail.com',
-        inbound: {
-          adapter: 'imap',
-          options: {
-            host: 'imap-mail.outlook.com',
-            port: '993',
-            ssl: true,
-            user: params[:email],
-            password: params[:password],
-          },
-        },
-        outbound: {
-          adapter: 'smtp',
-          options: {
-            host: 'smtp-mail.outlook.com',
-            port: 25,
-            start_tls: true,
-            user: params[:email],
-            password: params[:password],
-          }
-        },
-      },
-    }
-
-    # probe based on email domain and mx
-    domains = [domain]
-    mail_exchangers = mxers(domain)
-    if mail_exchangers && mail_exchangers[0]
-      logger.info "MX for #{domain}: #{mail_exchangers} - #{mail_exchangers[0][0]}"
-    end
-    if mail_exchangers && mail_exchangers[0] && mail_exchangers[0][0]
-      domains.push mail_exchangers[0][0]
-    end
-    provider_map.each {|_provider, settings|
-      domains.each {|domain_to_check|
-
-        next if domain_to_check !~ /#{settings[:domain]}/i
-
-        # probe inbound
-        result = email_probe_inbound( settings[:inbound] )
-        if result[:result] != 'ok'
-          render json: result
-          return # rubocop:disable Lint/NonLocalExitFromIterator
-        end
-
-        # probe outbound
-        result = email_probe_outbound( settings[:outbound], params[:email] )
-        if result[:result] != 'ok'
-          render json: result
-          return # rubocop:disable Lint/NonLocalExitFromIterator
-        end
-
-        render json: {
-          result: 'ok',
-          setting: settings,
-        }
-        return # rubocop:disable Lint/NonLocalExitFromIterator
-      }
-    }
-
-    # probe inbound
-    inbound_map = []
-    if mail_exchangers && mail_exchangers[0] && mail_exchangers[0][0]
-      inbound_mx = [
-        {
-          adapter: 'imap',
-          options: {
-            host: mail_exchangers[0][0],
-            port: 993,
-            ssl: true,
-            user: user,
-            password: params[:password],
-          },
-        },
-        {
-          adapter: 'imap',
-          options: {
-            host: mail_exchangers[0][0],
-            port: 993,
-            ssl: true,
-            user: params[:email],
-            password: params[:password],
-          },
-        },
-      ]
-      inbound_map = inbound_map + inbound_mx
-    end
-    inbound_auto = [
-      {
-        adapter: 'imap',
-        options: {
-          host: "mail.#{domain}",
-          port: 993,
-          ssl: true,
-          user: user,
-          password: params[:password],
-        },
-      },
-      {
-        adapter: 'imap',
-        options: {
-          host: "mail.#{domain}",
-          port: 993,
-          ssl: true,
-          user: params[:email],
-          password: params[:password],
-        },
-      },
-      {
-        adapter: 'imap',
-        options: {
-          host: "imap.#{domain}",
-          port: 993,
-          ssl: true,
-          user: user,
-          password: params[:password],
-        },
-      },
-      {
-        adapter: 'imap',
-        options: {
-          host: "imap.#{domain}",
-          port: 993,
-          ssl: true,
-          user: params[:email],
-          password: params[:password],
-        },
-      },
-      {
-        adapter: 'pop3',
-        options: {
-          host: "mail.#{domain}",
-          port: 995,
-          ssl: true,
-          user: user,
-          password: params[:password],
-        },
-      },
-      {
-        adapter: 'pop3',
-        options: {
-          host: "mail.#{domain}",
-          port: 995,
-          ssl: true,
-          user: params[:email],
-          password: params[:password],
-        },
-      },
-      {
-        adapter: 'pop3',
-        options: {
-          host: "pop.#{domain}",
-          port: 995,
-          ssl: true,
-          user: user,
-          password: params[:password],
-        },
-      },
-      {
-        adapter: 'pop3',
-        options: {
-          host: "pop.#{domain}",
-          port: 995,
-          ssl: true,
-          user: params[:email],
-          password: params[:password],
-        },
-      },
-      {
-        adapter: 'pop3',
-        options: {
-          host: "pop3.#{domain}",
-          port: 995,
-          ssl: true,
-          user: user,
-          password: params[:password],
-        },
-      },
-      {
-        adapter: 'pop3',
-        options: {
-          host: "pop3.#{domain}",
-          port: 995,
-          ssl: true,
-          user: params[:email],
-          password: params[:password],
-        },
-      },
-    ]
-    inbound_map = inbound_map + inbound_auto
-    settings = {}
-    success = false
-    inbound_map.each {|config|
-      logger.info "INBOUND PROBE: #{config.inspect}"
-      result = email_probe_inbound( config )
-      logger.info "INBOUND RESULT: #{result.inspect}"
-
-      next if result[:result] != 'ok'
-
-      success = true
-      settings[:inbound] = config
-      break
-    }
-
-    if !success
-      render json: {
-        result: 'failed',
-      }
-      return
-    end
-
-    # probe outbound
-    outbound_map = []
-    if mail_exchangers && mail_exchangers[0] && mail_exchangers[0][0]
-      outbound_mx = [
-        {
-          adapter: 'smtp',
-          options: {
-            host: mail_exchangers[0][0],
-            port: 25,
-            start_tls: true,
-            user: user,
-            password: params[:password],
-          },
-        },
-        {
-          adapter: 'smtp',
-          options: {
-            host: mail_exchangers[0][0],
-            port: 25,
-            start_tls: true,
-            user: params[:email],
-            password: params[:password],
-          },
-        },
-        {
-          adapter: 'smtp',
-          options: {
-            host: mail_exchangers[0][0],
-            port: 465,
-            start_tls: true,
-            user: user,
-            password: params[:password],
-          },
-        },
-        {
-          adapter: 'smtp',
-          options: {
-            host: mail_exchangers[0][0],
-            port: 465,
-            start_tls: true,
-            user: params[:email],
-            password: params[:password],
-          },
-        },
-      ]
-      outbound_map = outbound_map + outbound_mx
-    end
-    outbound_auto = [
-      {
-        adapter: 'smtp',
-        options: {
-          host: "mail.#{domain}",
-          port: 25,
-          start_tls: true,
-          user: user,
-          password: params[:password],
-        },
-      },
-      {
-        adapter: 'smtp',
-        options: {
-          host: "mail.#{domain}",
-          port: 25,
-          start_tls: true,
-          user: params[:email],
-          password: params[:password],
-        },
-      },
-      {
-        adapter: 'smtp',
-        options: {
-          host: "mail.#{domain}",
-          port: 465,
-          start_tls: true,
-          user: user,
-          password: params[:password],
-        },
-      },
-      {
-        adapter: 'smtp',
-        options: {
-          host: "mail.#{domain}",
-          port: 465,
-          start_tls: true,
-          user: params[:email],
-          password: params[:password],
-        },
-      },
-      {
-        adapter: 'smtp',
-        options: {
-          host: "smtp.#{domain}",
-          port: 25,
-          start_tls: true,
-          user: user,
-          password: params[:password],
-        },
-      },
-      {
-        adapter: 'smtp',
-        options: {
-          host: "smtp.#{domain}",
-          port: 25,
-          start_tls: true,
-          user: params[:email],
-          password: params[:password],
-        },
-      },
-      {
-        adapter: 'smtp',
-        options: {
-          host: "smtp.#{domain}",
-          port: 465,
-          start_tls: true,
-          user: user,
-          password: params[:password],
-        },
-      },
-      {
-        adapter: 'smtp',
-        options: {
-          host: "smtp.#{domain}",
-          port: 465,
-          start_tls: true,
-          user: params[:email],
-          password: params[:password],
-        },
-      },
-    ]
-
-    success = false
-    outbound_map.each {|config|
-      logger.info "OUTBOUND PROBE: #{config.inspect}"
-      result = email_probe_outbound( config, params[:email] )
-      logger.info "OUTBOUND RESULT: #{result.inspect}"
-
-      next if result[:result] != 'ok'
-
-      success = true
-      settings[:outbound] = config
-      break
-    }
-
-    if !success
-      render json: {
-        result: 'failed',
-      }
-      return
-    end
-
-    render json: {
-      result: 'ok',
-      setting: settings,
-    }
+    # probe settings based on email and password
+    render json: EmailHelper::Probe.full(
+      email: params[:email],
+      password: params[:password],
+    )
   end
 
   def email_outbound
@@ -609,18 +205,8 @@ curl http://localhost/api/v1/getting_started -v -u #{login}:#{password}
     # check admin permissions
     return if deny_if_not_role(Z_ROLENAME_ADMIN)
 
-    # validate params
-    if !params[:adapter]
-      render json: {
-        result: 'invalid',
-      }
-      return
-    end
-
     # connection test
-    result = email_probe_outbound( params, params[:email] )
-
-    render json: result
+    render json: EmailHelper::Probe.outbound(params, params[:email])
   end
 
   def email_inbound
@@ -628,18 +214,8 @@ curl http://localhost/api/v1/getting_started -v -u #{login}:#{password}
     # check admin permissions
     return if deny_if_not_role(Z_ROLENAME_ADMIN)
 
-    # validate params
-    if !params[:adapter]
-      render json: {
-        result: 'invalid',
-      }
-      return
-    end
-
     # connection test
-    result = email_probe_inbound( params )
-
-    render json: result
+    render json: EmailHelper::Probe.inbound(params)
   end
 
   def email_verify
@@ -653,295 +229,80 @@ curl http://localhost/api/v1/getting_started -v -u #{login}:#{password}
     else
       subject = params[:subject]
     end
-    result = email_probe_outbound( params[:outbound], params[:meta][:email], subject )
 
-    (1..5).each {
-      sleep 10
+    result = EmailHelper::Verify.email(
+      outbound: params[:outbound],
+      inbound: params[:inbound],
+      sender: params[:meta][:email],
+      subject: subject,
+    )
 
-      # fetch mailbox
-      found = nil
+    # check delivery for 30 sek.
+    if result[:result] != 'ok'
+      render json: result
+      return
+    end
 
-      begin
-        if params[:inbound][:adapter] =~ /^imap$/i
-          found = Channel::IMAP.new.fetch( { options: params[:inbound][:options] }, 'verify', subject )
-        else
-          found = Channel::POP3.new.fetch( { options: params[:inbound][:options] }, 'verify', subject )
-        end
-      rescue => e
-        render json: {
-          result: 'invalid',
-          message: e.to_s,
-          subject: subject,
-        }
-        return
-      end
-
-      next if !found
-      next if found != 'verify ok'
-
-      # remember address
-      address = EmailAddress.where( email: params[:meta][:email] ).first
-      if !address
-        address = EmailAddress.first
-      end
-      if address
-        address.update_attributes(
-          realname: params[:meta][:realname],
-          email: params[:meta][:email],
-          active: 1,
-          updated_by_id: 1,
-          created_by_id: 1,
-        )
-      else
-        EmailAddress.create(
-          realname: params[:meta][:realname],
-          email: params[:meta][:email],
-          active: 1,
-          updated_by_id: 1,
-          created_by_id: 1,
-        )
-      end
-
-      # store mailbox
-      Channel.create(
-        area: 'Email::Inbound',
-        adapter: params[:inbound][:adapter],
-        options: params[:inbound][:options],
-        group_id: 1,
+    # remember address
+    address = EmailAddress.where( email: params[:meta][:email] ).first
+    if !address
+      address = EmailAddress.first
+    end
+    if address
+      address.update_attributes(
+        realname: params[:meta][:realname],
+        email: params[:meta][:email],
         active: 1,
         updated_by_id: 1,
         created_by_id: 1,
       )
+    else
+      EmailAddress.create(
+        realname: params[:meta][:realname],
+        email: params[:meta][:email],
+        active: 1,
+        updated_by_id: 1,
+        created_by_id: 1,
+      )
+    end
 
-      # save settings
-      if params[:outbound][:adapter] =~ /^smtp$/i
-        smtp = Channel.where( adapter: 'SMTP', area: 'Email::Outbound' ).first
-        smtp.options = params[:outbound][:options]
-        smtp.active  = true
-        smtp.save!
-        sendmail = Channel.where( adapter: 'Sendmail' ).first
-        sendmail.active = false
-        sendmail.save!
-      else
-        sendmail = Channel.where( adapter: 'Sendmail', area: 'Email::Outbound' ).first
-        sendmail.options = {}
-        sendmail.active  = true
-        sendmail.save!
-        smtp = Channel.where( adapter: 'SMTP' ).first
-        smtp.active = false
-        smtp.save
-      end
+    # store mailbox
+    Channel.create(
+      area: 'Email::Inbound',
+      adapter: params[:inbound][:adapter],
+      options: params[:inbound][:options],
+      group_id: 1,
+      active: 1,
+      updated_by_id: 1,
+      created_by_id: 1,
+    )
 
-      render json: {
-        result: 'ok',
-      }
-      return
-    }
+    # save settings
+    if params[:outbound][:adapter] =~ /^smtp$/i
+      smtp = Channel.where( adapter: 'SMTP', area: 'Email::Outbound' ).first
+      smtp.options = params[:outbound][:options]
+      smtp.active  = true
+      smtp.save!
+      sendmail = Channel.where( adapter: 'Sendmail' ).first
+      sendmail.active = false
+      sendmail.save!
+    else
+      sendmail = Channel.where( adapter: 'Sendmail', area: 'Email::Outbound' ).first
+      sendmail.options = {}
+      sendmail.active  = true
+      sendmail.save!
+      smtp = Channel.where( adapter: 'SMTP' ).first
+      smtp.active = false
+      smtp.save
+    end
 
-    # check delivery for 30 sek.
     render json: {
-      result: 'invalid',
-      message: 'Verification Email not found in mailbox.',
-      subject: subject,
+      result: 'ok',
     }
   end
 
   private
 
-  def email_probe_outbound(params, email, subject = nil)
-
-    # validate params
-    if !params[:adapter]
-      result = {
-        result: 'invalid',
-        message: 'Invalid, need adapter!',
-      }
-      return result
-    end
-
-    if subject
-      mail = {
-        :from             => email,
-        :to               => email,
-        :subject          => "Zammad Getting started Test Email #{subject}",
-        :body             => "This is a Test Email of Zammad to check if sending and receiving is working correctly.\n\nYou can ignore or delete this email.",
-        'x-zammad-ignore' => 'true',
-      }
-    else
-      mail = {
-        from: email,
-        to: 'emailtrytest@znuny.com',
-        subject: 'test',
-        body: 'test',
-      }
-    end
-
-    # test connection
-    translation_map = {
-      'authentication failed'                                     => 'Authentication failed!',
-      'Incorrect username'                                        => 'Authentication failed!',
-      'getaddrinfo: nodename nor servname provided, or not known' => 'Hostname not found!',
-      'No route to host'                                          => 'No route to host!',
-      'Connection refused'                                        => 'Connection refused!',
-    }
-    if params[:adapter] =~ /^smtp$/i
-
-      # in case, fill missing params
-      if !params[:options].key?(:port)
-        params[:options][:port] = 25
-      end
-      if !params[:options].key?(:ssl)
-        params[:options][:ssl] = true
-      end
-
-      begin
-        Channel::SMTP.new.send(
-          mail,
-          {
-            options: params[:options]
-          }
-        )
-      rescue => e
-
-        # check if sending email was ok, but mailserver rejected
-        if !subject
-          white_map = {
-            'Recipient address rejected' => true,
-          }
-          white_map.each {|key, _message|
-
-            next if e.message !~ /#{Regexp.escape(key)}/i
-
-            result = {
-              result: 'ok',
-              settings: params,
-              notice: e.message,
-            }
-            return result
-          }
-        end
-        message_human = ''
-        translation_map.each {|key, message|
-          if e.message =~ /#{Regexp.escape(key)}/i
-            message_human = message
-          end
-        }
-        result = {
-          result: 'invalid',
-          settings: params,
-          message: e.message,
-          message_human: message_human,
-        }
-        return result
-      end
-      result = {
-        result: 'ok',
-      }
-      return result
-    end
-
-    begin
-      Channel::Sendmail.new.send(
-        mail,
-        nil
-      )
-    rescue => e
-      message_human = ''
-      translation_map.each {|key, message|
-        if e.message =~ /#{Regexp.escape(key)}/i
-          message_human = message
-        end
-      }
-      result = {
-        result: 'invalid',
-        settings: params,
-        message: e.message,
-        message_human: message_human,
-      }
-      return result
-    end
-    result = {
-      result: 'ok',
-    }
-    result
-  end
-
-  def email_probe_inbound(params)
-
-    # validate params
-    if !params[:adapter]
-      fail 'need :adapter param'
-    end
-
-    # connection test
-    translation_map = {
-      'authentication failed'                                     => 'Authentication failed!',
-      'Incorrect username'                                        => 'Authentication failed!',
-      'getaddrinfo: nodename nor servname provided, or not known' => 'Hostname not found!',
-      'No route to host'                                          => 'No route to host!',
-      'Connection refused'                                        => 'Connection refused!',
-    }
-    if params[:adapter] =~ /^imap$/i
-
-      begin
-        Channel::IMAP.new.fetch( { options: params[:options] }, 'check' )
-      rescue => e
-        message_human = ''
-        translation_map.each {|key, message|
-          if e.message =~ /#{Regexp.escape(key)}/i
-            message_human = message
-          end
-        }
-        result = {
-          result: 'invalid',
-          settings: params,
-          message: e.message,
-          message_human: message_human,
-        }
-        return result
-      end
-      result = {
-        result: 'ok',
-      }
-      return result
-    end
-
-    begin
-      Channel::POP3.new.fetch( { options: params[:options] }, 'check' )
-    rescue => e
-      message_human = ''
-      translation_map.each {|key, message|
-        if e.message =~ /#{Regexp.escape(key)}/i
-          message_human = message
-        end
-      }
-      result = {
-        result: 'invalid',
-        settings: params,
-        message: e.message,
-        message_human: message_human,
-      }
-      return result
-    end
-    result = {
-      result: 'ok',
-    }
-    result
-  end
-
-  def mxers(domain)
-    begin
-      mxs = Resolv::DNS.open do |dns|
-        ress = dns.getresources(domain, Resolv::DNS::Resource::IN::MX)
-        ress.map { |r| [r.exchange.to_s, IPSocket.getaddress(r.exchange.to_s), r.preference] }
-      end
-    rescue => e
-      logger.error e.message
-      logger.error e.backtrace.inspect
-    end
-    mxs
-  end
-
   def auto_wizard_enabled_response
     return false if !AutoWizard.enabled?
 
diff --git a/app/models/channel.rb b/app/models/channel.rb
index 52aea0951..12fa1dc87 100644
--- a/app/models/channel.rb
+++ b/app/models/channel.rb
@@ -11,13 +11,13 @@ class Channel < ApplicationModel
         # 'warning: toplevel constant Twitter referenced by Channel::Twitter' error e.g.
         # so we have to convert the channel name to the filename via Rails String.underscore
         # http://stem.ps/rails/2015/01/25/ruby-gotcha-toplevel-constant-referenced-by.html
-        require "channel/#{channel[:adapter].underscore}"
+        require "channel/#{channel[:adapter].to_filename}"
 
-        channel_object   = Object.const_get("Channel::#{channel[:adapter]}")
+        channel_object   = Object.const_get("Channel::#{channel[:adapter].to_classname}")
         channel_instance = channel_object.new
         channel_instance.fetch(channel)
       rescue => e
-        logger.error "Can't use Channel::#{channel[:adapter]}"
+        logger.error "Can't use Channel::#{channel[:adapter].to_classname}"
         logger.error e.inspect
         logger.error e.backtrace
       end
diff --git a/app/models/channel/imap.rb b/app/models/channel/imap.rb
index ccf230016..d0a00f65a 100644
--- a/app/models/channel/imap.rb
+++ b/app/models/channel/imap.rb
@@ -2,7 +2,7 @@
 
 require 'net/imap'
 
-class Channel::IMAP < Channel::EmailParser
+class Channel::Imap < Channel::EmailParser
 
   def fetch (channel, check_type = '', verify_string = '')
     ssl  = true
diff --git a/app/models/channel/pop3.rb b/app/models/channel/pop3.rb
index 1a98c6502..d96d85c31 100644
--- a/app/models/channel/pop3.rb
+++ b/app/models/channel/pop3.rb
@@ -2,7 +2,7 @@
 
 require 'net/pop'
 
-class Channel::POP3 < Channel::EmailParser
+class Channel::Pop3 < Channel::EmailParser
 
   def fetch (channel, check_type = '', verify_string = '')
     ssl  = true
diff --git a/lib/email_helper.rb b/lib/email_helper.rb
new file mode 100644
index 000000000..2697fd1b5
--- /dev/null
+++ b/lib/email_helper.rb
@@ -0,0 +1,614 @@
+module EmailHelper
+
+=begin
+
+get mail parts
+
+  user, domain = EmailHelper.parse_email('somebody@example.com')
+
+returns
+
+  [user, domain]
+
+=end
+
+  def self.parse_email(email)
+    user   = nil
+    domain = nil
+    if email =~ /^(.+?)@(.+?)$/
+      user   = $1
+      domain = $2
+    end
+    [user, domain]
+  end
+
+=begin
+
+get list of providers with inbound and outbound settings
+
+  map = EmailHelper.provider(email, password)
+
+returns
+
+  {
+    google: {
+      domain: 'gmail.com|googlemail.com|gmail.de',
+      inbound: {
+        adapter: 'imap',
+        options: {
+          host: 'imap.gmail.com',
+          port: 993,
+          ssl: true,
+          user: email,
+          password: password,
+        },
+      },
+      outbound: {
+        adapter: 'smtp',
+        options: {
+          host: 'smtp.gmail.com',
+          port: 25,
+          start_tls: true,
+          user: email,
+          password: password,
+        }
+      },
+    },
+    ...
+  }
+
+=end
+
+  def self.provider(email, password)
+    # check domain based attributes
+    provider_map = {
+      google: {
+        domain: 'gmail.com|googlemail.com|gmail.de',
+        inbound: {
+          adapter: 'imap',
+          options: {
+            host: 'imap.gmail.com',
+            port: 993,
+            ssl: true,
+            user: email,
+            password: password,
+          },
+        },
+        outbound: {
+          adapter: 'smtp',
+          options: {
+            host: 'smtp.gmail.com',
+            port: 25,
+            start_tls: true,
+            user: email,
+            password: password,
+          }
+        },
+      },
+      microsoft: {
+        domain: 'outlook.com|hotmail.com',
+        inbound: {
+          adapter: 'imap',
+          options: {
+            host: 'imap-mail.outlook.com',
+            port: 993,
+            ssl: true,
+            user: email,
+            password: password,
+          },
+        },
+        outbound: {
+          adapter: 'smtp',
+          options: {
+            host: 'smtp-mail.outlook.com',
+            port: 25,
+            start_tls: true,
+            user: email,
+            password: password,
+          }
+        },
+      },
+    }
+    provider_map
+  end
+
+=begin
+
+get possible inbound settings based on mx
+
+  map = EmailHelper.provider_inbound_mx(user, email, password, mx_domains)
+
+returns
+
+  {
+    adapter: 'imap',
+    options: {
+      host: mx_domains[0],
+      port: 993,
+      ssl: true,
+      user: user,
+      password: password,
+    },
+  },
+  {
+    adapter: 'imap',
+    options: {
+      host: mx_domains[0],
+      port: 993,
+      ssl: true,
+      user: email,
+      password: password,
+    },
+  },
+
+=end
+
+  def self.provider_inbound_mx(user, email, password, mx_domains)
+    inbound_mxs = []
+    mx_domains.each {|domain|
+      inbound_mx = [
+        {
+          adapter: 'imap',
+          options: {
+            host: domain,
+            port: 993,
+            ssl: true,
+            user: user,
+            password: password,
+          },
+        },
+        {
+          adapter: 'imap',
+          options: {
+            host: domain,
+            port: 993,
+            ssl: true,
+            user: email,
+            password: password,
+          },
+        },
+      ]
+      puts "ll #{inbound_mx.inspect}"
+      inbound_mxs = inbound_mxs.concat(inbound_mx)
+    }
+    inbound_mxs
+  end
+
+=begin
+
+get possible inbound settings based on mx
+
+  map = EmailHelper.provider_inbound_mx(user, email, password, mx_domains)
+
+returns
+
+  {
+    adapter: 'imap',
+    options: {
+      host: mx_domains[0],
+      port: 993,
+      ssl: true,
+      user: user,
+      password: password,
+    },
+  },
+  {
+    adapter: 'imap',
+    options: {
+      host: mx_domains[0],
+      port: 993,
+      ssl: true,
+      user: email,
+      password: password,
+    },
+  },
+
+=end
+
+  def self.provider_inbound_mx(user, email, password, mx_domains)
+    inbounds = []
+    mx_domains.each {|domain|
+      inbound = [
+        {
+          adapter: 'imap',
+          options: {
+            host: domain,
+            port: 993,
+            ssl: true,
+            user: user,
+            password: password,
+          },
+        },
+        {
+          adapter: 'imap',
+          options: {
+            host: domain,
+            port: 993,
+            ssl: true,
+            user: email,
+            password: password,
+          },
+        },
+      ]
+      inbounds = inbounds.concat(inbound)
+    }
+    inbounds
+  end
+
+=begin
+
+get possible inbound settings based on guess
+
+  map = EmailHelper.provider_inbound_guess(user, email, password, domain)
+
+returns
+
+  {
+    adapter: 'imap',
+    options: {
+      host: "mail.#{domain}",
+      port: 993,
+      ssl: true,
+      user: user,
+      password: password,
+    },
+  },
+  {
+    adapter: 'imap',
+    options: {
+      host: "mail.#{domain}",
+      port: 993,
+      ssl: true,
+      user: email,
+      password: password,
+    },
+  },
+  ...
+
+=end
+
+  def self.provider_inbound_guess(user, email, password, domain)
+    inbound_mx = [
+      {
+        adapter: 'imap',
+        options: {
+          host: "mail.#{domain}",
+          port: 993,
+          ssl: true,
+          user: user,
+          password: password,
+        },
+      },
+      {
+        adapter: 'imap',
+        options: {
+          host: "mail.#{domain}",
+          port: 993,
+          ssl: true,
+          user: email,
+          password: password,
+        },
+      },
+      {
+        adapter: 'imap',
+        options: {
+          host: "imap.#{domain}",
+          port: 993,
+          ssl: true,
+          user: user,
+          password: password,
+        },
+      },
+      {
+        adapter: 'imap',
+        options: {
+          host: "imap.#{domain}",
+          port: 993,
+          ssl: true,
+          user: email,
+          password: password,
+        },
+      },
+      {
+        adapter: 'pop3',
+        options: {
+          host: "mail.#{domain}",
+          port: 995,
+          ssl: true,
+          user: user,
+          password: password,
+        },
+      },
+      {
+        adapter: 'pop3',
+        options: {
+          host: "mail.#{domain}",
+          port: 995,
+          ssl: true,
+          user: email,
+          password: password,
+        },
+      },
+      {
+        adapter: 'pop3',
+        options: {
+          host: "pop.#{domain}",
+          port: 995,
+          ssl: true,
+          user: user,
+          password: password,
+        },
+      },
+      {
+        adapter: 'pop3',
+        options: {
+          host: "pop.#{domain}",
+          port: 995,
+          ssl: true,
+          user: email,
+          password: password,
+        },
+      },
+      {
+        adapter: 'pop3',
+        options: {
+          host: "pop3.#{domain}",
+          port: 995,
+          ssl: true,
+          user: user,
+          password: password,
+        },
+      },
+      {
+        adapter: 'pop3',
+        options: {
+          host: "pop3.#{domain}",
+          port: 995,
+          ssl: true,
+          user: email,
+          password: password,
+        },
+      },
+    ]
+    inbound_mx
+  end
+
+=begin
+
+get possible outbound settings based on mx
+
+  map = EmailHelper.provider_outbound_mx(user, email, password, mx_domains)
+
+returns
+
+  {
+    adapter: 'smtp',
+    options: {
+      host: domain,
+      port: 25,
+      start_tls: true,
+      user: user,
+      password: password,
+    },
+  },
+  {
+    adapter: 'smtp',
+    options: {
+      host: domain,
+      port: 25,
+      start_tls: true,
+      user: email,
+      password: password,
+    },
+  },
+
+=end
+
+  def self.provider_outbound_mx(user, email, password, mx_domains)
+    outbound_mxs = []
+    mx_domains.each {|domain|
+      outbound_mx = [
+        {
+          adapter: 'smtp',
+          options: {
+            host: domain,
+            port: 25,
+            start_tls: true,
+            user: user,
+            password: password,
+          },
+        },
+        {
+          adapter: 'smtp',
+          options: {
+            host: domain,
+            port: 25,
+            start_tls: true,
+            user: email,
+            password: password,
+          },
+        },
+        {
+          adapter: 'smtp',
+          options: {
+            host: domain,
+            port: 465,
+            start_tls: true,
+            user: user,
+            password: password,
+          },
+        },
+        {
+          adapter: 'smtp',
+          options: {
+            host: domain,
+            port: 465,
+            start_tls: true,
+            user: email,
+            password: password,
+          },
+        },
+      ]
+      outbound_mxs = outbound_mxs.concat(outbound_mx)
+    }
+    outbound_mxs
+  end
+
+=begin
+
+get possible outbound settings based on guess
+
+  map = EmailHelper.provider_outbound_guess(user, email, password, domain)
+
+returns
+
+  {
+    adapter: 'imap',
+    options: {
+      host: "mail.#{domain}",
+      port: 993,
+      ssl: true,
+      user: user,
+      password: password,
+    },
+  },
+  {
+    adapter: 'imap',
+    options: {
+      host: "mail.#{domain}",
+      port: 993,
+      ssl: true,
+      user: email,
+      password: password,
+    },
+  },
+  ...
+
+=end
+
+  def self.provider_outbound_guess(user, email, password, domain)
+    outbound_mx = [
+      {
+        adapter: 'smtp',
+        options: {
+          host: "mail.#{domain}",
+          port: 25,
+          start_tls: true,
+          user: user,
+          password: password,
+        },
+      },
+      {
+        adapter: 'smtp',
+        options: {
+          host: "mail.#{domain}",
+          port: 25,
+          start_tls: true,
+          user: email,
+          password: password,
+        },
+      },
+      {
+        adapter: 'smtp',
+        options: {
+          host: "mail.#{domain}",
+          port: 465,
+          start_tls: true,
+          user: user,
+          password: password,
+        },
+      },
+      {
+        adapter: 'smtp',
+        options: {
+          host: "mail.#{domain}",
+          port: 465,
+          start_tls: true,
+          user: email,
+          password: password,
+        },
+      },
+      {
+        adapter: 'smtp',
+        options: {
+          host: "smtp.#{domain}",
+          port: 25,
+          start_tls: true,
+          user: user,
+          password: password,
+        },
+      },
+      {
+        adapter: 'smtp',
+        options: {
+          host: "smtp.#{domain}",
+          port: 25,
+          start_tls: true,
+          user: email,
+          password: password,
+        },
+      },
+      {
+        adapter: 'smtp',
+        options: {
+          host: "smtp.#{domain}",
+          port: 465,
+          start_tls: true,
+          user: user,
+          password: password,
+        },
+      },
+      {
+        adapter: 'smtp',
+        options: {
+          host: "smtp.#{domain}",
+          port: 465,
+          start_tls: true,
+          user: email,
+          password: password,
+        },
+      },
+    ]
+    outbound_mx
+  end
+
+=begin
+
+get dns mx records of domain
+
+  mx_records = EmailHelper.mx_records('example.com')
+
+returns
+
+  ['mx1.example.com', 'mx2.example.com']
+
+=end
+
+  def self.mx_records(domain)
+    mail_exchangers = mxers(domain)
+    if mail_exchangers && mail_exchangers[0]
+      Rails.logger.info "MX for #{domain}: #{mail_exchangers} - #{mail_exchangers[0][0]}"
+    end
+    mx_records = []
+    if mail_exchangers && mail_exchangers[0] && mail_exchangers[0][0]
+      mx_records.push mail_exchangers[0][0]
+    end
+    mx_records
+  end
+
+  def self.mxers(domain)
+    begin
+      mxs = Resolv::DNS.open do |dns|
+        ress = dns.getresources(domain, Resolv::DNS::Resource::IN::MX)
+        ress.map { |r|
+          [r.exchange.to_s, IPSocket.getaddress(r.exchange.to_s), r.preference]
+        }
+      end
+    rescue => e
+      Rails.logger.error e.message
+      Rails.logger.error e.backtrace.inspect
+    end
+    mxs
+  end
+
+end
\ No newline at end of file
diff --git a/lib/email_helper/probe.rb b/lib/email_helper/probe.rb
new file mode 100644
index 000000000..4bfd14ed8
--- /dev/null
+++ b/lib/email_helper/probe.rb
@@ -0,0 +1,376 @@
+module EmailHelper
+  class Probe
+
+=begin
+
+get result of probe
+
+  result = EmailHelper::Probe.full(
+    email: 'znuny@example.com',
+    password: 'somepassword',
+  )
+
+returns on success
+
+  {
+    result: 'ok',
+    inbound: {
+      adapter: 'imap',
+      options: {
+        host: 'imap.gmail.com',
+        port: 993,
+        ssl: true,
+        user: 'some@example.com',
+        password: 'password',
+      },
+    },
+    outbound: {
+      adapter: 'smtp',
+      options: {
+        host: 'smtp.gmail.com',
+        port: 25,
+        ssl: true,
+        user: 'some@example.com',
+        password: 'password',
+      },
+    },
+  }
+
+returns on fail
+
+  result = {
+    result: 'failed',
+  }
+
+=end
+
+    def self.full(params)
+
+      user, domain = EmailHelper.parse_email(params[:email])
+
+      if !user || !domain
+        result = {
+          result: 'invalid',
+          messages: {
+            email: 'Invalid email.'
+          },
+        }
+        return result
+      end
+
+      # probe provider based settings
+      provider_map = EmailHelper.provider(params[:email], params[:password])
+      domains = [domain]
+
+      # get mx records, try to find provider based on mx records
+      mx_records = EmailHelper.mx_records(domain)
+      domains = domains.concat(mx_records)
+      provider_map.each {|_provider, settings|
+        domains.each {|domain_to_check|
+
+          next if domain_to_check !~ /#{settings[:domain]}/i
+
+          # probe inbound
+          result = EmailHelper::Probe.inbound(settings[:inbound])
+          next if result[:result] != 'ok'
+
+          # probe outbound
+          result = EmailHelper::Probe.outbound(settings[:outbound], params[:email])
+          next if result[:result] != 'ok'
+
+          result = {
+            result: 'ok',
+            setting: settings,
+          }
+          return result
+        }
+      }
+
+      # probe guess settings
+
+      # probe inbound
+      inbound_mx = EmailHelper.provider_inbound_mx(user, params[:email], params[:password], mx_records)
+      inbound_guess = EmailHelper.provider_inbound_guess(user, params[:email], params[:password], domain)
+      inbound_map = inbound_mx + inbound_guess
+      settings = {}
+      success = false
+      inbound_map.each {|config|
+        Rails.logger.info "INBOUND PROBE: #{config.inspect}"
+        result = EmailHelper::Probe.inbound( config )
+        Rails.logger.info "INBOUND RESULT: #{result.inspect}"
+
+        next if result[:result] != 'ok'
+
+        success = true
+        settings[:inbound] = config
+        break
+      }
+
+      if !success
+        result = {
+          result: 'failed',
+        }
+        return result
+      end
+
+      # probe outbound
+      outbound_mx = EmailHelper.provider_outbound_mx(user, params[:email], params[:password], mx_records)
+      outbound_guess = EmailHelper.provider_outbound_guess(user, params[:email], params[:password], domain)
+      outbound_map = outbound_mx + outbound_guess
+
+      success = false
+      outbound_map.each {|config|
+        Rails.logger.info "OUTBOUND PROBE: #{config.inspect}"
+        result = EmailHelper::Probe.outbound( config, params[:email] )
+        Rails.logger.info "OUTBOUND RESULT: #{result.inspect}"
+
+        next if result[:result] != 'ok'
+
+        success = true
+        settings[:outbound] = config
+        break
+      }
+
+      if !success
+        result = {
+          result: 'failed',
+        }
+        return result
+      end
+
+      {
+        result: 'ok',
+        setting: settings,
+      }
+    end
+
+=begin
+
+get result of inbound probe
+
+  result = EmailHelper::Probe.inbound(
+    adapter: 'imap',
+    options: {
+      host: 'imap.gmail.com',
+      port: 993,
+      ssl: true,
+      user: 'some@example.com',
+      password: 'password',
+    }
+  )
+
+returns on success
+
+  {
+    result: 'ok'
+  }
+
+returns on fail
+
+  result = {
+    result: 'invalid',
+    settings: {
+      host: 'imap.gmail.com',
+      port: 993,
+      ssl: true,
+      user: 'some@example.com',
+      password: 'password',
+    },
+    message: 'error message from used lib',
+    message_human: 'translated error message, readable for humans',
+  }
+
+=end
+
+    def self.inbound(params)
+
+      # validate params
+      if !params[:adapter]
+        result = {
+          result: 'invalid',
+          message: 'Invalid, need adapter!',
+        }
+        return result
+      end
+
+      # connection test
+      begin
+        if params[:adapter] =~ /^imap$/i
+          Channel::Imap.new.fetch( { options: params[:options] }, 'check' )
+        elsif params[:adapter] =~ /^pop3$/i
+          Channel::Pop3.new.fetch( { options: params[:options] }, 'check' )
+        else
+          fail "Invalid adapter '#{params[:adapter]}'"
+        end
+      rescue => e
+        message_human = ''
+        translations.each {|key, message|
+          if e.message =~ /#{Regexp.escape(key)}/i
+            message_human = message
+          end
+        }
+        result = {
+          result: 'invalid',
+          settings: params,
+          message: e.message,
+          message_human: message_human,
+        }
+        return result
+      end
+      result = {
+        result: 'ok',
+      }
+      result
+    end
+
+=begin
+
+get result of outbound probe
+
+  result = EmailHelper::Probe.outbound(
+    {
+      adapter: 'smtp',
+      options: {
+        host: 'smtp.gmail.com',
+        port: 25,
+        ssl: true,
+        user: 'some@example.com',
+        password: 'password',
+      }
+    },
+    'sender@example.com',
+  )
+
+returns on success
+
+  {
+    result: 'ok'
+  }
+
+returns on fail
+
+  result = {
+    result: 'invalid',
+    settings: {
+      host: 'stmp.gmail.com',
+      port: 25,
+      ssl: true,
+      user: 'some@example.com',
+      password: 'password',
+    },
+    message: 'error message from used lib',
+    message_human: 'translated error message, readable for humans',
+  }
+
+=end
+
+    def self.outbound(params, email, subject = nil)
+
+      # validate params
+      if !params[:adapter]
+        result = {
+          result: 'invalid',
+          message: 'Invalid, need adapter!',
+        }
+        return result
+      end
+
+      if subject
+        mail = {
+          :from             => email,
+          :to               => email,
+          :subject          => "Zammad Getting started Test Email #{subject}",
+          :body             => "This is a Test Email of Zammad to check if sending and receiving is working correctly.\n\nYou can ignore or delete this email.",
+          'x-zammad-ignore' => 'true',
+        }
+      else
+        mail = {
+          from: email,
+          to: 'emailtrytest@znuny.com',
+          subject: 'This is a Test Email',
+          body: "This is a Test Email of Zammad to verify if Zammad can send emails to an external address.\n\nIf you see this email, you can ignore and delete it.",
+        }
+      end
+
+      # test connection
+      begin
+
+        if params[:adapter] =~ /^smtp$/i
+
+          # in case, fill missing params
+          if !params[:options].key?(:port)
+            params[:options][:port] = 25
+          end
+          if !params[:options].key?(:ssl)
+            params[:options][:ssl] = true
+          end
+          Channel::SMTP.new.send(
+            mail,
+            {
+              options: params[:options]
+            }
+          )
+        elsif params[:adapter] =~ /^sendmail$/i
+          Channel::Sendmail.new.send(
+            mail,
+            nil
+          )
+        else
+          fail "Invalid adapter '#{params[:adapter]}'"
+        end
+      rescue => e
+
+        # check if sending email was ok, but mailserver rejected
+        if !subject
+          white_map = {
+            'Recipient address rejected' => true,
+          }
+          white_map.each {|key, _message|
+
+            next if e.message !~ /#{Regexp.escape(key)}/i
+
+            result = {
+              result: 'ok',
+              settings: params,
+              notice: e.message,
+            }
+            return result
+          }
+        end
+        message_human = ''
+        translations.each {|key, message|
+          if e.message =~ /#{Regexp.escape(key)}/i
+            message_human = message
+          end
+        }
+        result = {
+          result: 'invalid',
+          settings: params,
+          message: e.message,
+          message_human: message_human,
+        }
+        return result
+      end
+      result = {
+        result: 'ok',
+      }
+      result
+    end
+
+    def self.translations
+      {
+        'authentication failed'                                     => 'Authentication failed!',
+        'Username and Password not accepted'                        => 'Authentication failed!',
+        'Incorrect username'                                        => 'Authentication failed, username incorrect!',
+        'Lookup failed'                                             => 'Authentication failed, username incorrect!',
+        'Invalid credentials'                                       => 'Authentication failed, invalid credentials!',
+        'getaddrinfo: nodename nor servname provided, or not known' => 'Hostname not found!',
+        'No route to host'                                          => 'No route to host!',
+        'execution expired'                                         => 'Host not reachable!',
+        'Connection refused'                                        => 'Connection refused!',
+      }
+    end
+
+  end
+
+end
diff --git a/lib/email_helper/verify.rb b/lib/email_helper/verify.rb
new file mode 100644
index 000000000..edcefb013
--- /dev/null
+++ b/lib/email_helper/verify.rb
@@ -0,0 +1,106 @@
+module EmailHelper
+  class Verify
+
+=begin
+
+get result of inbound probe
+
+  result = EmailHelper::Verify.email(
+    inbound: {
+      adapter: 'imap',
+      options: {
+        host: 'imap.gmail.com',
+        port: 993,
+        ssl: true,
+        user: 'some@example.com',
+        password: 'password',
+      },
+    },
+    outbound: {
+      adapter: 'smtp',
+      options: {
+        host: 'smtp.gmail.com',
+        port: 25,
+        ssl: true,
+        user: 'some@example.com',
+        password: 'password',
+      },
+    },
+    sender: 'sender@example.com',
+  )
+
+returns on success
+
+  {
+    result: 'ok'
+  }
+
+returns on fail
+
+  {
+    result: 'invalid',
+    message: 'Verification Email not found in mailbox.',
+    subject: subject,
+  }
+
+or
+
+  {
+    result: 'invalid',
+    message: 'Authentication failed!.',
+    subject: subject,
+  }
+
+=end
+
+    def self.email(params)
+
+      # send verify email
+      if !params[:subject]
+        subject = '#' + rand(99_999_999_999).to_s
+      else
+        subject = params[:subject]
+      end
+      result = EmailHelper::Probe.outbound( params[:outbound], params[:sender], subject )
+
+      # looking for verify email
+      (1..5).each {
+        sleep 10
+
+        # fetch mailbox
+        found = nil
+
+        begin
+          if params[:inbound][:adapter] =~ /^imap$/i
+            found = Channel::Imap.new.fetch( { options: params[:inbound][:options] }, 'verify', subject )
+          else
+            found = Channel::Pop3.new.fetch( { options: params[:inbound][:options] }, 'verify', subject )
+          end
+        rescue => e
+          render json: {
+            result: 'invalid',
+            message: e.to_s,
+            subject: subject,
+          }
+          return
+        end
+
+        next if !found
+        next if found != 'verify ok'
+
+        return {
+          result: 'ok',
+        }
+
+      }
+
+      {
+        result: 'invalid',
+        message: 'Verification Email not found in mailbox.',
+        subject: subject,
+      }
+    end
+
+  end
+
+end
diff --git a/test/unit/email_helper_test.rb b/test/unit/email_helper_test.rb
new file mode 100644
index 000000000..6b1f675c8
--- /dev/null
+++ b/test/unit/email_helper_test.rb
@@ -0,0 +1,445 @@
+# encoding: utf-8
+require 'test_helper'
+
+class EmailHelperTest < ActiveSupport::TestCase
+
+  test 'a mx_records' do
+
+    domain = 'znuny.com'
+    mx_domains = EmailHelper.mx_records(domain)
+    assert_equal('arber.znuny.com', mx_domains[0])
+
+  end
+
+  test 'a email parser test' do
+
+    user, domain = EmailHelper.parse_email('somebody@example.com')
+    assert_equal('somebody', user)
+    assert_equal('example.com', domain)
+
+    user, domain = EmailHelper.parse_email('somebody+test@example.com')
+    assert_equal('somebody+test', user)
+    assert_equal('example.com', domain)
+
+    user, domain = EmailHelper.parse_email('somebody+testexample.com')
+    assert_not(user)
+    assert_not(domain)
+
+  end
+
+  test 'provider test' do
+    email = 'linus@kernel.org'
+    password = 'some_pw'
+    map = EmailHelper.provider(email, password)
+
+    assert_equal('imap', map[:google][:inbound][:adapter])
+    assert_equal('imap.gmail.com', map[:google][:inbound][:options][:host])
+    assert_equal(993, map[:google][:inbound][:options][:port])
+    assert_equal(email, map[:google][:inbound][:options][:user])
+    assert_equal(password, map[:google][:inbound][:options][:password])
+
+    assert_equal('smtp', map[:google][:outbound][:adapter])
+    assert_equal('smtp.gmail.com', map[:google][:outbound][:options][:host])
+    assert_equal(25, map[:google][:outbound][:options][:port])
+    assert_equal(true, map[:google][:outbound][:options][:start_tls])
+    assert_equal(email, map[:google][:outbound][:options][:user])
+    assert_equal(password, map[:google][:outbound][:options][:password])
+
+  end
+
+  test 'provider_inbound_mx' do
+
+    email = 'linus@znuny.com'
+    password = 'some_pw'
+    user, domain = EmailHelper.parse_email(email)
+    mx_domains = EmailHelper.mx_records(domain)
+    map = EmailHelper.provider_inbound_mx(user, email, password, mx_domains)
+
+    assert_equal('imap', map[0][:adapter])
+    assert_equal('arber.znuny.com', map[0][:options][:host])
+    assert_equal(993, map[0][:options][:port])
+    assert_equal(user, map[0][:options][:user])
+    assert_equal(password, map[0][:options][:password])
+
+    assert_equal('imap', map[1][:adapter])
+    assert_equal('arber.znuny.com', map[1][:options][:host])
+    assert_equal(993, map[1][:options][:port])
+    assert_equal(email, map[1][:options][:user])
+    assert_equal(password, map[1][:options][:password])
+
+  end
+
+  test 'provider_inbound_guess' do
+
+    email = 'linus@znuny.com'
+    password = 'some_pw'
+    user, domain = EmailHelper.parse_email(email)
+    map = EmailHelper.provider_inbound_guess(user, email, password, domain)
+
+    assert_equal('imap', map[0][:adapter])
+    assert_equal('mail.znuny.com', map[0][:options][:host])
+    assert_equal(993, map[0][:options][:port])
+    assert_equal(user, map[0][:options][:user])
+    assert_equal(password, map[0][:options][:password])
+
+    assert_equal('imap', map[1][:adapter])
+    assert_equal('mail.znuny.com', map[1][:options][:host])
+    assert_equal(993, map[1][:options][:port])
+    assert_equal(email, map[1][:options][:user])
+    assert_equal(password, map[1][:options][:password])
+
+  end
+
+  test 'provider_outbound_mx' do
+
+    email = 'linus@znuny.com'
+    password = 'some_pw'
+    user, domain = EmailHelper.parse_email(email)
+    mx_domains = EmailHelper.mx_records(domain)
+    map = EmailHelper.provider_outbound_mx(user, email, password, mx_domains)
+
+    assert_equal('smtp', map[0][:adapter])
+    assert_equal('arber.znuny.com', map[0][:options][:host])
+    assert_equal(25, map[0][:options][:port])
+    assert_equal(true, map[0][:options][:start_tls])
+    assert_equal(user, map[0][:options][:user])
+    assert_equal(password, map[0][:options][:password])
+
+    assert_equal('smtp', map[1][:adapter])
+    assert_equal('arber.znuny.com', map[1][:options][:host])
+    assert_equal(25, map[1][:options][:port])
+    assert_equal(true, map[1][:options][:start_tls])
+    assert_equal(email, map[1][:options][:user])
+    assert_equal(password, map[1][:options][:password])
+
+  end
+
+  test 'provider_outbound_guess' do
+
+    email = 'linus@znuny.com'
+    password = 'some_pw'
+    user, domain = EmailHelper.parse_email(email)
+    map = EmailHelper.provider_outbound_guess(user, email, password, domain)
+
+    assert_equal('smtp', map[0][:adapter])
+    assert_equal('mail.znuny.com', map[0][:options][:host])
+    assert_equal(25, map[0][:options][:port])
+    assert_equal(true, map[0][:options][:start_tls])
+    assert_equal(user, map[0][:options][:user])
+    assert_equal(password, map[0][:options][:password])
+
+    assert_equal('smtp', map[1][:adapter])
+    assert_equal('mail.znuny.com', map[1][:options][:host])
+    assert_equal(25, map[1][:options][:port])
+    assert_equal(true, map[1][:options][:start_tls])
+    assert_equal(email, map[1][:options][:user])
+    assert_equal(password, map[1][:options][:password])
+
+  end
+
+  test 'z probe_inbound' do
+
+    # network issues
+    result = EmailHelper::Probe.inbound(
+      adapter: 'imap',
+      options: {
+        host: 'not_existsing_host',
+        port: 993,
+        ssl: true,
+        user: 'some@example.com',
+        password: 'password',
+      }
+    )
+
+    assert_equal('invalid', result[:result])
+    assert_equal('Hostname not found!', result[:message_human])
+    assert_equal('not_existsing_host', result[:settings][:options][:host])
+
+    result = EmailHelper::Probe.inbound(
+      adapter: 'imap',
+      options: {
+        host: 'www.zammad.com',
+        port: 993,
+        ssl: true,
+        user: 'some@example.com',
+        password: 'password',
+      }
+    )
+    assert_equal('invalid', result[:result])
+    assert_equal('Connection refused!', result[:message_human])
+    assert_equal('www.zammad.com', result[:settings][:options][:host])
+
+    result = EmailHelper::Probe.inbound(
+      adapter: 'imap',
+      options: {
+        host: '172.42.42.42',
+        port: 993,
+        ssl: true,
+        user: 'some@example.com',
+        password: 'password',
+      }
+    )
+    assert_equal('invalid', result[:result])
+    assert_equal('Host not reachable!', result[:message_human])
+    assert_equal('172.42.42.42', result[:settings][:options][:host])
+
+    # gmail
+    result = EmailHelper::Probe.inbound(
+      adapter: 'imap',
+      options: {
+        host: 'imap.gmail.com',
+        port: 993,
+        ssl: true,
+        user: 'some@example.com',
+        password: 'password',
+      }
+    )
+    assert_equal('invalid', result[:result])
+    assert_equal('Authentication failed, username incorrect!', result[:message_human])
+    assert_equal('imap.gmail.com', result[:settings][:options][:host])
+
+    result = EmailHelper::Probe.inbound(
+      adapter: 'imap',
+      options: {
+        host: 'imap.gmail.com',
+        port: 993,
+        ssl: true,
+        user: 'frank.tailor05@googlemail.com',
+        password: 'password',
+      }
+    )
+    assert_equal('invalid', result[:result])
+    assert_equal('Authentication failed, invalid credentials!', result[:message_human])
+    assert_equal('imap.gmail.com', result[:settings][:options][:host])
+
+    # dovecot
+    result = EmailHelper::Probe.inbound(
+      adapter: 'imap',
+      options: {
+        host: 'arber.znuny.com',
+        port: 993,
+        ssl: true,
+        user: 'some@example.com',
+        password: 'password',
+      }
+    )
+    assert_equal('invalid', result[:result])
+    assert_equal('Authentication failed!', result[:message_human])
+    assert_equal('arber.znuny.com', result[:settings][:options][:host])
+
+    # realtest - test I
+    if !ENV['EMAILHELPER_MAILBOX_1']
+      raise "Need EMAILHELPER_MAILBOX_1 as ENV variable like export EMAILHELPER_MAILBOX_1='unittestemailhelper01@znuny.com:somepass'"
+      return
+    end
+    mailbox_user     = ENV['EMAILHELPER_MAILBOX_1'].split(':')[0]
+    mailbox_password = ENV['EMAILHELPER_MAILBOX_1'].split(':')[1]
+    user, domain = EmailHelper.parse_email(mailbox_user)
+    result = EmailHelper::Probe.inbound(
+      adapter: 'imap',
+      options: {
+        host: 'arber.znuny.com',
+        port: 993,
+        ssl: true,
+        user: user,
+        password: mailbox_password,
+      }
+    )
+    assert_equal('ok', result[:result])
+
+  end
+
+  test 'z probe_outbound' do
+
+    # network issues
+    result = EmailHelper::Probe.outbound(
+      {
+        adapter: 'smtp',
+        options: {
+          host: 'not_existsing_host',
+          port: 25,
+          start_tls: true,
+          user: 'some@example.com',
+          password: 'password',
+        }
+      },
+      'some@example.com',
+    )
+
+    assert_equal('invalid', result[:result])
+    assert_equal('Hostname not found!', result[:message_human])
+    assert_equal('not_existsing_host', result[:settings][:options][:host])
+
+    result = EmailHelper::Probe.outbound(
+      {
+        adapter: 'smtp',
+        options: {
+          host: 'www.zammad.com',
+          port: 25,
+          start_tls: true,
+          user: 'some@example.com',
+          password: 'password',
+        }
+      },
+      'some@example.com',
+    )
+    assert_equal('invalid', result[:result])
+    assert_equal('Connection refused!', result[:message_human])
+    assert_equal('www.zammad.com', result[:settings][:options][:host])
+
+    result = EmailHelper::Probe.outbound(
+      {
+        adapter: 'smtp',
+        options: {
+          host: '172.42.42.42',
+          port: 25,
+          start_tls: true,
+          user: 'some@example.com',
+          password: 'password',
+        }
+      },
+      'some@example.com',
+    )
+    assert_equal('invalid', result[:result])
+    assert_equal('Host not reachable!', result[:message_human])
+    assert_equal('172.42.42.42', result[:settings][:options][:host])
+
+    # gmail
+    result = EmailHelper::Probe.outbound(
+      {
+        adapter: 'smtp',
+        options: {
+          host: 'smtp.gmail.com',
+          port: 25,
+          start_tls: true,
+          user: 'some@example.com',
+          password: 'password',
+        }
+      },
+      'some@example.com',
+    )
+    assert_equal('invalid', result[:result])
+    assert_equal('Authentication failed!', result[:message_human])
+    assert_equal('smtp.gmail.com', result[:settings][:options][:host])
+
+    result = EmailHelper::Probe.outbound(
+      {
+        adapter: 'smtp',
+        options: {
+          host: 'smtp.gmail.com',
+          port: 25,
+          start_tls: true,
+          user: 'frank.tailor05@googlemail.com',
+          password: 'password',
+        }
+      },
+      'some@example.com',
+    )
+    assert_equal('invalid', result[:result])
+    assert_equal('Authentication failed!', result[:message_human])
+    assert_equal('smtp.gmail.com', result[:settings][:options][:host])
+
+    # dovecot
+    result = EmailHelper::Probe.outbound(
+      {
+        adapter: 'smtp',
+        options: {
+          host: 'arber.znuny.com',
+          port: 25,
+          start_tls: true,
+          user: 'some@example.com',
+          password: 'password',
+        }
+      },
+      'some@example.com',
+    )
+    assert_equal('invalid', result[:result])
+    assert_equal('Authentication failed!', result[:message_human])
+    assert_equal('arber.znuny.com', result[:settings][:options][:host])
+
+    # realtest - test I
+    if !ENV['EMAILHELPER_MAILBOX_1']
+      raise "Need EMAILHELPER_MAILBOX_1 as ENV variable like export EMAILHELPER_MAILBOX_1='unittestemailhelper01@znuny.com:somepass'"
+      return
+    end
+    mailbox_user     = ENV['EMAILHELPER_MAILBOX_1'].split(':')[0]
+    mailbox_password = ENV['EMAILHELPER_MAILBOX_1'].split(':')[1]
+    user, domain = EmailHelper.parse_email(mailbox_user)
+    result = EmailHelper::Probe.outbound(
+      {
+        adapter: 'smtp',
+        options: {
+          host: 'arber.znuny.com',
+          port: 25,
+          start_tls: true,
+          user: user,
+          password: mailbox_password,
+        }
+      },
+      mailbox_user,
+    )
+    assert_equal('ok', result[:result])
+  end
+
+  test 'zz probe' do
+
+    result = EmailHelper::Probe.full(
+      email: 'invalid_format',
+      password: 'somepass',
+    )
+    assert_equal('invalid', result[:result])
+    assert_not(result[:setting])
+
+    # realtest - test I
+    if !ENV['EMAILHELPER_MAILBOX_1']
+      raise "Need EMAILHELPER_MAILBOX_1 as ENV variable like export EMAILHELPER_MAILBOX_1='unittestemailhelper01@znuny.com:somepass'"
+    end
+    mailbox_user     = ENV['EMAILHELPER_MAILBOX_1'].split(':')[0]
+    mailbox_password = ENV['EMAILHELPER_MAILBOX_1'].split(':')[1]
+
+    result = EmailHelper::Probe.full(
+      email: mailbox_user,
+      password: mailbox_password,
+    )
+    assert_equal('ok', result[:result])
+    assert_equal('arber.znuny.com', result[:setting][:inbound][:options][:host])
+    assert_equal('arber.znuny.com', result[:setting][:outbound][:options][:host])
+
+  end
+
+  test 'zz verify' do
+
+    # realtest - test I
+    if !ENV['EMAILHELPER_MAILBOX_1']
+      raise "Need EMAILHELPER_MAILBOX_1 as ENV variable like export EMAILHELPER_MAILBOX_1='unittestemailhelper01@znuny.com:somepass'"
+    end
+    mailbox_user     = ENV['EMAILHELPER_MAILBOX_1'].split(':')[0]
+    mailbox_password = ENV['EMAILHELPER_MAILBOX_1'].split(':')[1]
+    user, domain = EmailHelper.parse_email(mailbox_user)
+    result = EmailHelper::Verify.email(
+      inbound: {
+        adapter: 'imap',
+        options: {
+          host: 'arber.znuny.com',
+          port: 993,
+          ssl: true,
+          user: user,
+          password: mailbox_password,
+        },
+      },
+      outbound: {
+        adapter: 'smtp',
+        options: {
+          host: 'arber.znuny.com',
+          port: 25,
+          start_tls: true,
+          user: user,
+          password: mailbox_password,
+        },
+      },
+      sender: mailbox_user,
+    )
+    assert_equal('ok', result[:result])
+  end
+
+end