generate_missing_message_id

# File actionmailbox/app/models/action_mailbox/inbound_email/message_id.rb, line 32
      def generate_missing_message_id(message_checksum)
        Mail::MessageIdField.new("<#{message_checksum}@#{::Socket.gethostname}.mail>").message_id.tap do |message_id|
          logger.warn "Message-ID couldn't be parsed or is missing. Generated a new Message-ID: #{message_id}"
        end
      end