Have you ever had sent an e-mail (e.g. to a customer) where you noticed an important error one second after you have sent it (though proof-read before)? The browser-based home banking system of my bank has some kind of bank transfer queue. It allows to edit or delete bank scheduled transfers for an half hour, even after logging out and logging in again.
Does anybody knows a tool between the e-mail client and e-mail server which delays the e-mails for a short period of time, e.g. 15min, and allows to easily clear messages out of the queue to prevent final sending?
I'm using Mozilla Thunderbird on Windows and connect to an SSL/TLS authenticated postfix server on Linux.