I'm not looking to block senders, I'm looking to block recipients. For instance, I've occasionally hit Reply and written an email to an address of the type [email protected], [email protected], or [email protected], and then wondered why I never got a response, only to see that they require responses through a web form or something.

There are also some addresses who might be CC'ed on a message, but who I would never want to reply to, for instance.

I'd like to make a filter for addresses like this, so that if I try to send to them, it either aborts and moves it to the Drafts folder, or it gets redirected to myself, etc.

  • 1
    How about a label ("dev/null" perhaps), using a high-contrast color, to which all inbound mail from these sorts of addresses would get added to? It's not blocking, but it would probably get your attention.
    – ale
    Commented Oct 28, 2011 at 16:53
  • I've once accidentally misspelled someone's email address and now gmail always offers the wrong address first, I also want to block recipients!
    – domotorp
    Commented Feb 8, 2016 at 17:02
  • 1
    @domotorp I did that too, so I renamed that new contact to "NOOOOOOOOOOOOOO"
    – endolith
    Commented Feb 8, 2016 at 17:33

3 Answers 3


Filters apply to incoming mail, not outgoing. So as of now - you can't do anything to prevent yourself from replying back to these.

The closest you can do is create a label titled "do-not-reply-to-these-mails" which is bright red in colour as a reminder


You could also write a time triggered google apps script that checks the recipients of recently sent messages and send you back a warning message if there is any on your 'blacklist'. This solution, however, wouldn't stop you from sending messages.

Here's an example of a script accessing sent emails.


If you have the G-Suite you can create a content compliance rule and reject any email with specific text in the headers including an email address.

Navigate here: Apps -> G Suite -> Settings for Gmail -> Advanced settings

And then create a content compliance rule like this:

Email messages to affect -> (Outbound, Internal - sending)

If the above expressions match, do the following -> reject

Here is the google help doc: Set up rules for content compliance

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service and acknowledge you have read our privacy policy.

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