If Mozilla crashes or something else untoward happens while composing a message, it is lost. Could unsent and unfiled compositions be saved to a swap file or something (ala emacs, vim) before being sent?
changing the status. This might be a dup bug.
*** Bug 129352 has been marked as a duplicate of this bug. ***
*** This bug has been marked as a duplicate of 16360 ***
verifying is as a dup of 16360 based on comments in that bug.