Install an UNDO button, please!
I can't count the number of times I've deleted rows of wording after having swiped over the pad while pressing 'enter' - not my intention, I assure you, but it would be great were you to install something which would allow one to 'UNDO" that last move, even one, or even more! If this aspect would serve somehow to threaten the security of my computer or your servers, you could automatically delete anything retained after the email was sent or even drafted. Thanks!
David Ney commented
This would save me an enormous amount of time; perhaps it's just the way my laptop is configured physically, but I often erase whole emails and there is absolutely no way to get it back. It's gotten to the point where I often write an email on Word first and know that it's right before I transfer the whole thing onto my email to be sent.