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Sendmail + Cyrus Local From: Verify

By Anish Mistry

Background - 2005-06-22

Over the past week or so we have been receiving a lot of spam that forged the From: header of a non-existent user with our local domain. ie. somefakeuser@united-ware.com. This became really annoying so I wrote some sendmail rules to lookup the "mail from:" and the "From:" header in the Cyrus (cyrusv2) database.

Instructions

  1. Cyrus v2.1.20 or greater. Lower versions may work, but 2.1.20 was what we are using.
  2. Sendmail 8.13 or greater or Sendmail 8.12.7 with the socketmap patch.
  3. Beyond the normal Cyrus compile flags for Sendmail. You will need to compile it with -DSOCKETMAP.
  4. In /usr/local/etc/cyrus.conf add smmap cmd="smmapd" listen="/var/imap/socket/smmapd" prefork=0 to create the socket map.
  5. Restart Cyrus. killall -HUP master
  6. Add the from verify code to your .mc
  7. Rebuild your .cf and then stop and start Sendmail.cd /etc/mail && make && make install && make stop && make start
  8. Enjoy!
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