There is no way to undelete a message that has been marked as deletetd in another program. 1) Setup IMAP mail acc and set "When I delte a message" to "Mark it as deleted" 2) use another program (e.g webmail) to read you mail 3) in the other program (webmail) delete a message (so it is _marked as delted_ not moved to trash) 4) quit the other program 5) start mozilla 6) go to the message and try to undelete it. -> There is no undelete command or option -> delteing the msg and then using "Undo Delete" undoes the delete you just performed so the mesagge is still marked as deleted.

Hmm... If you delte the message in mozilla (6b above) and then choose "Undo delete message" the message is undelted but this does not show in the UI until you change folder and then back again. Updated summary

(Sorry for the SPAM) I don't know why I only just noticed this now but this happens for messages that you delete in mozilla to. its a pain to have to delete a deleted messsage so you can undo it!. I guess there are two bugs in here...

*** This bug has been marked as a duplicate of 59694 ***

Verified as duplicate.