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Slamming Spam: A Guide for System Administrators by Robert Haskins, Dale Nielsen

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Sender Verification (Chapter 12)

Active Spam Killer (ASK) http://ask.thinkhost.com/

Camram, proof of work, electronic signature, CRM114 interface http://www.camram.org/

checkpassword-pam, an implementation of checkpassword-compatible authentication program http://checkpasswd-pam.sourceforge.net/

EmailRelay SMTP proxy and store-and-forward MTA http://emailrelay.sourceforge.net/

Hashcash Proof of work web site http://www.hashcash.org/

NormalizeMIME, a MIME email message parser http://hyvatti.iki.fi/~jaakko/spam/

Python language home http://www.python.org

Tagged Message Delivery Agent (TMDA) home http://tmda.net

TMDA Web interface http://tmda.net/tmda-cgi

TRE regular expression matching library http://laurikari.net/tre/

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