Just an FYI that I've done a much more mucking around with the mail server on ufies.org. If you're one of the folks who does have an account there, please keep an eye out for any mail being rejected improperly, or anything out of the ordinary. Seems one of the configurations that had a whole bunch of awesome anti-spam stuff in it was being superseded by a duplicate line farther down the file, but that one didn't have the awesome anti-spam stuff. Fingers crossed this will make things better....
If you do see oddness, please email me at alan at ufies dot org or if that's broken, arcterex at gmail dot com (or if you're all web 2.0, hit me up at @ufies on twitter).