Fix: Find mailbox with cc email (#4372)

app/finders/email_channel_finder.rb

@@ -0,0 +1,15 @@
+class EmailChannelFinder
+  def initialize(email_object)
+    @email_object = email_object
+  end
+
+  def perform
+    channel = nil
+    recipient_mails = @email_object.to.to_a + @email_object.cc.to_a
+    recipient_mails.each do |email|
+      channel = Channel::Email.find_by('lower(email) = ? OR lower(forward_to_email) = ?', email.downcase, email.downcase)
+      break if channel.present?
+    end
+    channel
+  end
+end

app/mailboxes/application_mailbox.rb

@@ -21,17 +21,20 @@ class ApplicationMailbox < ActionMailbox::Base
   def self.support_mail?
     proc do |inbound_mail_obj|
       is_a_support_email = false
-      inbound_mail_obj.mail.to&.each do |email|
-        channel = Channel::Email.find_by('lower(email) = ? OR lower(forward_to_email) = ?', email.downcase, email.downcase)
-        if channel.present?
-          is_a_support_email = true
-          break
-        end
-      end
+
+      is_a_support_email = true if reply_to_mail?(inbound_mail_obj, is_a_support_email)
+
       is_a_support_email
     end
   end
 
+  def self.reply_to_mail?(inbound_mail_obj, is_a_support_email)
+    return if is_a_support_email
+
+    channel = EmailChannelFinder.new(inbound_mail_obj.mail).perform
+    channel.present?
+  end
+
   def self.catch_all_mail?
     proc { |_mail| true }
   end

app/mailboxes/mailbox_helper.rb

@@ -2,6 +2,8 @@ module MailboxHelper
   private
 
   def create_message
+    return if @conversation.messages.find_by(source_id: processed_mail.message_id).present?
+
     @message = @conversation.messages.create(
       account_id: @conversation.account_id,
       sender: @conversation.contact,

app/mailboxes/support_mailbox.rb

@@ -21,15 +21,17 @@ class SupportMailbox < ApplicationMailbox
   private
 
   def find_channel
-    mail.to.each do |email|
-      @channel = Channel::Email.find_by('lower(email) = ? OR lower(forward_to_email) = ?', email.downcase, email.downcase)
-      break if @channel.present?
-    end
+    find_channel_with_to_mail if @channel.blank?
+
     raise 'Email channel/inbox not found' if @channel.nil?
 
     @channel
   end
 
+  def find_channel_with_to_mail
+    @channel = EmailChannelFinder.new(mail).perform
+  end
+
   def load_account
     @account = @channel.account
   end