I would like send auto-reply mails to email addresses written in reply-to field. How this can be achieved?

  Sample Mail Received :
 from:  abc@gmail.com
 reply-to:  def@gmail.com
 to:    ghi@gmail.com
 date:  Aug 31, 2020, 12:43 AM    

By using the template and filter options I am able to send auto-reply e-mails to addresses written in from field (abc@gmail.com in this case). But I am not able to figure how to send auto-reply to addresses written in reply-to field (def@gmail.com in this case).

1 Answer 1


Google does not support this.

It is possible write a Google Apps Script, possibly/probably including the Gmail API , to generate an email that has the appearance of being an auto-reply (a "pseudo-autoreply"). There are many precedents for this. However these do not have the character of auto-reply emails, and they have some inherent limitations.

  • auto-reply is triggered when an email is received. Apps Script has no equivalent; however depending on the "urgency" of generating the pseudo-autoreply, a time-driven trigger might be used to scan the inbox and execute the script.
  • auto-reply does not mark the relevant message as "read". Depending on your needs, a pseudo-autoreply might need to avoid marking a message as read but in that case, it would need to label that message in such a way so that auto-replies are not continuously sent for that message. One option might be to use a single purpose-use label to denote that an autoreply has been sent.
  • an auto-reply does not become part of any message thread. A pseudo-autoreply would need an appropriate title to avoid being added to a thread.
  • genuine auto-replies have certain mail header values that identify their function, such as (but not limited to):
    • X-Autoreply
    • Auto-submitted

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.