That was close...
By Calum-Oracle on May 09, 2006
Kudos to the Thunderbird team for adding a neck-saving feature (maybe it's been there forever, but I've only just encountered it tonight)... an alert that pops up when you try to send a mail using the keyboard shortcut rather than clicking Send. How I've laughed in the past whenever I've sent incomplete/embarrassing/borderline-litigious emails by mistake (usually when trying to use some other keyboard shortcut, followed by Enter) before I'd counted to ten and rewritten them :)
Now, you could well argue that it's a poor shortcut (Cmd-Enter on Mac, presumably Ctrl-Enter on others) that's easy to hit by mistake. But it's kind of a standard one these days, so the warning is appreciated in the meantime until they pick a better one.