Block Spam from domains on the South Africa ISPA Spam Hall of Shame using DNSBL Part2

Posted by topdog on May 11, 2012 4:46 PM EDT; By Andrew Colin Kissa
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I previously wrote about how to block domains named in the ISPA Spam Hall of Shame using DNSBL at SMTP time, these domains have now resorted to using 3rd party senders to try and get their Junk through. Because they are using 3rd party senders the envelope from address is no longer the one that is listed on the hall of shame. In this post i will describe how you can catch the mail that has slipped through your SMTP DNSBL checks.

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