+undo
From Elendor
Syntax: +UNDO This command undoes the effects of your last message write, +edit, +include, or +undo command. (That means executing +UNDO twice in a row leaves your message unaffected.) It's particularly good for when you use +EDIT and accidentally fubar your entire message. Hit +UNDO and it will return to it's previous state. This command does not affect your addressee list or subject line.