diff --git a/app/assets/javascripts/app/lib/app_post/user_organization_autocompletion.coffee b/app/assets/javascripts/app/lib/app_post/user_organization_autocompletion.coffee
index b542fc746..1496e31c6 100644
--- a/app/assets/javascripts/app/lib/app_post/user_organization_autocompletion.coffee
+++ b/app/assets/javascripts/app/lib/app_post/user_organization_autocompletion.coffee
@@ -63,6 +63,15 @@ class App.UserOrganizationAutocompletion extends App.Controller
     @userSelect.focus() if not @formControl.hasClass 'focus'
 
   onBlur: =>
+    selectUser = @userSelect.val()
+    if _.isEmpty(selectUser)
+      @userId.val('')
+      return
+    if @attribute.guess is true
+      currentUserId = @userId.val()
+      if _.isEmpty(currentUserId) || currentUserId.match(/^guess:/)
+        if !_.isEmpty(selectUser)
+          @userId.val("guess:#{selectUser}")
     @formControl.removeClass 'focus'
 
   onUserClick: (e) =>
diff --git a/app/controllers/tickets_controller.rb b/app/controllers/tickets_controller.rb
index 0f0d71ad4..1effa6207 100644
--- a/app/controllers/tickets_controller.rb
+++ b/app/controllers/tickets_controller.rb
@@ -73,6 +73,29 @@ class TicketsController < ApplicationController
   def create
     clean_params = Ticket.param_association_lookup(params)
     clean_params = Ticket.param_cleanup(clean_params, true)
+
+    # try to create customer if needed
+    if clean_params[:customer_id] && clean_params[:customer_id] =~ /^guess:(.+?)$/
+      email = $1
+      if email !~ /@/ || email =~ /(>|<|\||\!|"|§|'|\$|%|&|\(|\)|\?|\s)/
+        render json: { error: 'Invalid email' }, status: :unprocessable_entity
+        return
+      end
+      customer = User.find_by(email: email)
+      if !customer
+        role_ids = Role.signup_role_ids
+        customer = User.create(
+          firstname: '',
+          lastname: '',
+          email: email,
+          password: '',
+          active: true,
+          role_ids: role_ids,
+        )
+      end
+      clean_params[:customer_id] = customer.id
+    end
+
     ticket = Ticket.new(clean_params)
 
     # check if article is given
diff --git a/db/migrate/20160819000001_update_setting_postmaster_filter2.rb b/db/migrate/20160819000001_update_setting_postmaster_filter2.rb
index d204ec165..589698778 100644
--- a/db/migrate/20160819000001_update_setting_postmaster_filter2.rb
+++ b/db/migrate/20160819000001_update_setting_postmaster_filter2.rb
@@ -11,5 +11,39 @@ class UpdateSettingPostmasterFilter2 < ActiveRecord::Migration
       state: 'Channel::Filter::SenderIsSystemAddress',
       frontend: false
     )
+    ObjectManager::Attribute.add(
+      force: true,
+      object: 'Ticket',
+      name: 'customer_id',
+      display: 'Customer',
+      data_type: 'user_autocompletion',
+      data_option: {
+        relation: 'User',
+        autocapitalize: false,
+        multiple: false,
+        guess: true,
+        null: false,
+        limit: 200,
+        placeholder: 'Enter Person or Organization/Company',
+        minLengt: 2,
+        translate: false,
+      },
+      editable: false,
+      active: true,
+      screens: {
+        create_top: {
+          Agent: {
+            null: false,
+          },
+        },
+        edit: {},
+      },
+      to_create: false,
+      to_migrate: false,
+      to_delete: false,
+      position: 10,
+      updated_by_id: 1,
+      created_by_id: 1,
+    )
   end
 end
diff --git a/db/seeds.rb b/db/seeds.rb
index 4ab4d21d4..990524999 100644
--- a/db/seeds.rb
+++ b/db/seeds.rb
@@ -3296,6 +3296,7 @@ ObjectManager::Attribute.add(
     relation: 'User',
     autocapitalize: false,
     multiple: false,
+    guess: true,
     null: false,
     limit: 200,
     placeholder: 'Enter Person or Organization/Company',