After a long, LONG time, I'm finally back on the road to updating my mail server setup. I eluded to setting up a new system a while back, and I'm starting to make progress on it. A tip of my hat to "Joe" at adminspotting.net for his messaging server setup. Some bugs arose with CentOS 5 on x86_64 and dovecot, but other than that, so far so good. The nuts-n-bolts of SMTP/POP/IMAP are setup and next is the anti-virus, anti-spam, greylisting, etc. etc. gauntlet.