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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