After my server was close to wasting all its CPU time for checking email
messages for potential spam using Spamassassin I decided that it was time
to investigate. My friend Arne, who helped me a lot with Qmail problems
earlier, recommended to install spamdyk, an SMTP spam filter that is
placed in front of Qmail and does not require specially patches for the
MTA itself. Spamdyk can filter mail by blacklisting, whitelisting,
greylisting and using several other options.
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