Spam

http://www.spamtest.ru/document?pubid=208050407&context=1

http://www.vamsoft.com/spfcheck.asp spf verification that works!!! (as opposed to http://www.openspf.org/Why?)

http://people.ucsc.edu/~jrudd/spamassassin/ SpamAssassin-Botnet – plugin for SA that checks if a msg was sent by a botnet node

http://sergeysl.pnz.ru/freebsd/mailsystem.php article in russian how to combine postfix /clamav/spamassassin in one manageable setup

http://catalogchoice.org/ Catalog Choice (it’s a .org) contacts catalog merchants on your behalf and gets them to stop sending you catalogs. For free.

http://recaptcha.net/learnmore.html cool CAPTCHA that is used to OCR books

http://slashdot.org/articles/07/07/11/150225.shtml interesting article about how hotmail and thers try to push “we will mark u as a SPAMMER if you don’t pay up”