Added check if sender is system address (show sender as agent in ticket zoom).

app/models/channel/filter/sender_is_system_address.rb

@@ -0,0 +1,32 @@
+# Copyright (C) 2012-2014 Zammad Foundation, http://zammad-foundation.org/
+
+module Channel::Filter::SenderIsSystemAddress
+
+  def self.run(_channel, mail)
+
+    # if attributes already set by header
+    return if mail[ 'x-zammad-ticket-create-article-sender'.to_sym ]
+    return if mail[ 'x-zammad-article-sender'.to_sym ]
+
+    # check if sender addesss is system
+    form = 'raw-from'.to_sym
+    return if !mail[form]
+    return if !mail[:to]
+
+    # in case, set sender
+    begin
+      return if !mail[form].addrs
+      items = mail[form].addrs
+      items.each { |item|
+        next if !EmailAddress.find_by(email: item.address.downcase)
+        mail[ 'x-zammad-ticket-create-article-sender'.to_sym ] = 'Agent'
+        mail[ 'x-zammad-article-sender'.to_sym ] = 'Agent'
+        return true
+      }
+    rescue => e
+      Rails.logger.error 'ERROR: SenderIsSystemAddress: ' + e.inspect
+    end
+
+    true
+  end
+end