How can I create a subject line or body text filter that filters outgoing email?

When the filter matches a message, the message should not be sent.

  • I'm not sure what you mean. Do you want to prevent sending an email that matches a specific filter? Feb 25, 2014 at 10:19

2 Answers 2


Filters are something that happen when an email is received, not sent - so what you ask for isn't possible with Gmail.


While not exactly what you are looking for, consider the Gmail Labs "delayed send" option. It gives you at the very least a short "undo" window.

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