Here's a great guide to reducing the risk of spam using sendmail. Additional information includes DNS blacklists, spam filters and procmail, securing identd, and more. "A properly configured BSD mail server can protect users from spam and Trojan horses while rejecting . . .
Here's a great guide to reducing the risk of spam using sendmail. Additional information includes DNS blacklists, spam filters and procmail, securing identd, and more. "A properly configured BSD mail server can protect users from spam and Trojan horses while rejecting virtually no legitimate content. This tutorial describes how to configure BSD systems to use DNS blacklists, procmail, mail "sanitizing" scripts, daemons that watch logs for evidence of spamming and "mail bombing," and similar utilities. Prevention of unauthorized relaying and detection and blocking of outbound spam are also discussed. Countermeasures against address harvesting and privacy invasion techniques such as "Rumplestiltskin" attacks, fingerd scans, tracking via identd, e-mail cookies, and malicious image tags in HTML mail are covered in detail. Links to source materials and relevant software tools are provided."

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