cyrus+sendmail+spamassasin HOWTO

This document will give you directions on how to set up SpamAssasin using a milter. This is necessary for users of Cyrus IMAPd when mail users do not have /etc/passwd accounts on the local machine as required for Procmail.
You are free to distribute or modify this in any way you like.
Send corrections or changes to Jon Snell at
This is the first draft of this doc, please let me know of successes or failures.
  • Compile sendmail and setup usual, hold off on installing your file
  • Compile and install libmilter
  • Compile and install SpamAssassin
  • Configure spamd of SpamAssassin to run at boot
  • Download and un-tgz check_local (get it from here)
  • Move the entire miltrassassin directory from check_local to sendmail-x.x.x/miltrassassin
  • cd into this directory
  • For Linux, edit the Makefile so -lpthread is the only line on LIBS and also edit the target directory to go to a directory that exists, /usr/bin
  • Create a new user for miltrassassin to run as, miltrass
    mkdir /var/run/miltrass
    chown miltrass.miltrass /var/run/miltrass
  • Run miltrassassin as its user (from root):
    su -c miltrass miltrassassin -p /var/run/miltrass/f1.sock
  • Configure it to load at boot
  • Add this to your before the define(`confLOCAL_MAILER... line:
    INPUT_MAIL_FILTER(`filter1', `S=local:/var/run/miltrass/f1.sock')
  • Install your
    sh ./Build install-cf from sendmail/cf/cf/
  • Run your new sendmail setup Notes:
  • If your system gets bogged down the filter may fail to respond quick enough. With this setup sendmail will just pass the mail along as if it had passed the tests.