I've been updating the server software again, and will be doing more upgrades tomorrow as well. The main upgrade so far is the mail system. I've upgraded both the mailserver itself, and the spam filtering system. Part of this involved retraining everyone's spam filters from the cached training they'd done before. I've tested several times with both of my accounts, and everything appears to be working, but please let me know if you find that any problems occur, especially when moving messages between folders (since that's when training occurs.) Also note that the mailserver was down for several hours while I did this, so some mail may be delayed for a few hours.
Tomorrow I'll be doing some (hopefully minor) updates to apache and PHP. Nothing like the major update that caused all the problems before, so it shouldn't be a big deal.