But let's skip to common ways to cancel a send.
2. Disconnect from the Internet to force it to fail.
In parting, very few email apps or servers allow more than a hundred BCC entries. This really upsets those that want to do this but hey, their server, their rules.
I'm sending a large bcc mail out and the email won't send as it cannot send with the server. This isn't the main problem really. The problem is when the popup alert telling me it won't send had 600 emails quoted in it and so the foot of this note where I want to press cancel is off screen. I can't tab to it either. Nor can I close the window, just minimise . HELP!!!