I use maildir, and for the most part, it works well.

However, I make the mistake of omitting a letter in a folder name, maildrop, instead of returning an error to the mta, makes a new file in Maildir/ called whatever it was that I typed, and puts mail in it in mailbox format.

This is bad, because I don't realize the problem for a long time, and I have no idea how to get my lost mail out of the wrong format into my proper maildir directories after this has happened!!

Any advice?