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qSheff: qmail spam & virus controller (investigate)

Forum topic
At some point, I'm going to need to install a spam & virus controller on my mail server. Until then, however, I'll use m3. Notes on an option:

qSheff is a wrapper for the qmail queue that scans email for viruses and
spam. After checking the message, it will wake the qmail queue. It is a
replacement program for qscanq and RAV antivirus. It is simple and more
powerful. It features the ability to quarantine, very nice logging, subject
filtering, a blackhole, easy installation, and white/black lists.


   * Simple, optimized, extandable fast code (About 1200 lines of C code)
   * Interoperability with various Antivirus / Spam software.
   * Detailed logging. (Comfortable for 'cut' and 'cat' operations to
produce statistics.)
   * Internal subject filter that supports regular expression matching
   * White/black lists.
   * Easy installation and administration
   * Easy debugging.
   * Quarantine directory for service providers.
   * Dropping mails with malformed headers
   * MRTG reporting of spammer avctivity
   * Easy debugging