Sendmail and Spamassassin

Sendmail works fine with HIP after you enable IPv6 in sendmail. We did some experimentation with spamassassin to integrate it with HIP puzzle mechanisms. See spamass-sendmail-debian-v1.patch, README.SPAMASS.HIPL and spamass-milter-0.3.0-hipl-v1.patch for some examples of configuration changes and instructions.