• ^List-Id:.*users.lists.fedoraproject.org | $DELIVER -m $DESTDIR/MLists/Fedora

You removed the '-d' parameter -- it may or may not work without it, but you'll need it in a virtual user setup. I'm not sure whether procmail sets $USER by itself or it gets passed as an environment variable, so if $USER is not working, use $LOGNAME, or better yet, just hardcode the value if this is your own script.

Also, the -m parameter is the name of a mailbox, not a pathname, so I think "MLists/Fedora" is what you want.

This is what I found in the procmail log: lda: Fatal: destination user parameter (-d user) not given

Well, this error couldn't be more explicit, can it?

Joseph Tam <jtam.home@gmail.com>