I can no longer reproduce this behavior. I suspect it must have been fixed with a recent Thunderbird update in edgy.
** Changed in: mozilla-thunderbird (Ubuntu) Status: Needs Info => Rejected -- Unable to stop composing an email without saving to drafts https://launchpad.net/bugs/72675 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs