Description:
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To me it looks like mlmmj creates a list of subscribers and goes through the list to send the mail. When it then finds an invalid mail address it stops and creates a re-queue. That's fine so far *but* it does *not* proceed with all the other mails.
I just checked some of our lists directories and noticed requeues from >1 year ago.
Our users are often complaining because e.g. the first ten of the list got the mail while the other 1000 didn't because of "one" invalid entry.

It would be really great when you'd improve the re-queue behaviour.