Limit Spam from Postfix Mail Server
http://www.postfix.org/TUNING_README.html
http://www.postfix.org/uce.html
http://jimsun.linxnet.com/misc/postfix-anti-UCE.txt - rob0: It's easy to knock out at least 90% of the spam, without content filtering of any kind.
holiday42: greylisting helped a great deal in my shop
holiday42: sqlgrey
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