Thanks for the suggestions...
I've got a couple boxes running 6, and they've been rock solid until this.
Looks like virus activity on a client for sure. I went through my Symantec logs remotely, and the users I suspect thankfully turned off their boxes Friday night.
Basically a couple user's mail accounts were collecting 2MB delivery failure reports - THOUSANDS of them. Obviously this took up a little space and slowed mail delivery locally to a stop.
I cleaned up the mailboxes and created a procmail rule to delete the delivery reports. We're holding steady at about 60% disk usage. I'm not convinced it should be that high, but at least it's not 100%.
I'm using a variety of contribs from many people here: antivirus, spam, etc. Didn't have much luck with the patern matching when I put this box in, but I'll have to spend some time this week updating the server. After I clean up the clients that is.

Again, thanks.
