create_reply (TMail::Mail)

    # File lib/action_mailer/vendor/tmail-1.1.0/tmail/interface.rb, line 478
        def create_reply
          mail = TMail::Mail.parse('')
          mail.subject = 'Re: ' + subject('').sub(/\A(?:\[[^\]]+\])?(?:\s*Re:)*\s*/i, '')
          mail.to_addrs = reply_addresses([])
          mail.in_reply_to = [message_id(nil)].compact
          mail.references = references([]) + [message_id(nil)].compact
          mail.mime_version = '1.0'
          mail
        end