I put together a spam/malware filtering mail server using amavisd-new, spamassassin, clamav, postfix and friends, but I didn't find any user interface for personal preferences and tuning. After a few months of searching, I ran across Maia Mailguard, which needs more polishing (but it's getting it, I think,) and nothing else even close to as good. Maybe this class of software would be called a quarantine manager.
What are others using? I'd welcome addition of Maia Mailguard to OpenBSD ports. I'm not sure I'd want to add and maintain it myself, though. Is anybody considering that? It does want to use its own version of amavisd, not amavisd-new's current version (a fork, I guess we should say.) Here is the home page (two URLs, probably the same destination): http://www.maiamailguard.com http://www.renaissoft.com/maia/index.php There's a FreeBSD postfix and friends installation guide that includes it, by Janky Jay: http://www.thekeyboardcowboys.org/help/fbsd_postfix/FreeBSD_Postfix.html Dale Carstensen