chore: Stop processing auto-response emails (#9606)

Stop processing auto-response emails
https://www.notion.so/chatwoot/Avoid-Auto-Replies-sorcerer-s-apprentice-mode-55ffb09efbd7451994f1ff852de4c168?pvs=4

app/mailboxes/support_mailbox.rb

@@ -1,4 +1,5 @@
 class SupportMailbox < ApplicationMailbox
+  include IncomingEmailValidityHelper
   attr_accessor :channel, :account, :inbox, :conversation, :processed_mail
 
   before_processing :find_channel,
@@ -9,16 +10,8 @@ class SupportMailbox < ApplicationMailbox
   def process
     Rails.logger.info "Processing email #{mail.message_id} from #{original_sender_email} to #{mail.to} with subject #{mail.subject}"
 
-    # to turn off spam conversation creation
-    return unless @account.active?
-    # prevent loop from chatwoot notification emails
-    return if notification_email_from_chatwoot?
-
-    # return if email doesn't have a valid sender
-    # This can happen in cases like bounce emails for invalid contact email address
-    # TODO: Handle the bounce seperately and mark the contact as invalid
-    # we are checking for @ since the returned value could be "\"\"" for some email clients
-    return unless original_sender_email.include?('@')
+    # Skip processing email if it belongs to any of the edge cases
+    return unless incoming_email_from_valid_email?
 
     ActiveRecord::Base.transaction do
       find_or_create_contact