Thanks for the input, everyone. I've summarized it all at http://bsdly.blogspot.com/2007/07/hey-spammer-heres-list-for-you.html - the list grows and more hosts than usual hang on talking to our spamd.
-- Peter N. M. Hansteen, member of the first RFC 1149 implementation team http://www.blug.linux.no/rfc1149/ http://www.datadok.no/ 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.