I understand how to apply Outlook rules to Gmail when filtering incoming messages but I have not found any similar support for rules on outgoing messages. The way I set up my Outlook account was to have a rule where all my outgoing messages are delayed by one minute (sit in my outbox for one minute) before actually being sent. The reason for this is to avoid double emails. I'm sure we've all sent an email only to realize we forgot to include the attachment seconds later.
Is there a way to set this up for Gmail?