Cancel sending email

Hello!  It seems it is impossible to cancel a sending-process.
Iam right there is no function to stop sending an emai?  Or where is the function hide?

Hello Jens,
once you click send you cannot stop the messages from being sent.
Only exception would be if you used the Delayed-send option which would keep your message in Outbox until the set time.


Is it possible to have in future?