In response to various tidbits that popped up in this thread, I put together some notes on setting up a sane email system, in a "works for me" article:
http://bsdly.blogspot.com/2012/05/in-name-of-sane-email-setting-up-spamd.html -- Peter N. M. Hansteen, member of the first RFC 1149 implementation team http://bsdly.blogspot.com/ http://www.bsdly.net/ http://www.nuug.no/ "Remember to set the evil bit on all malicious network traffic" delilah spamd[29949]: 85.152.224.147: disconnected after 42673 seconds.
