I have installed spamassassin, per the instructions on Scalix's wiki, and it is working, with some important caviats. So I asked for help on the spamassassin user list, and got some, but I think I am butting up against some Centos specific issues... This is what I am seeing in the maillog: Aug 17 14:39:59 z9m9z sendmail[13082]: l7HIdvGf013082: Milter add: header: X-Spam-Checker-Version: SpamAssassin 3.1.9 (2007-02-13) on\n\tz9m9z.htt-consult.com Aug 17 14:39:59 z9m9z spamd[13032]: spamd: connection from localhost.localdomain [127.0.0.1] at port 40454 Aug 17 14:39:59 z9m9z spamd[13032]: spamd: setuid to root succeeded Aug 17 14:39:59 z9m9z spamd[13032]: spamd: still running as root: user not specified with -u, not found, or set to root, falling back to nobody at /usr/bin/spamd line 1161, <GEN10> line 4. Aug 17 14:39:59 z9m9z spamd[13032]: spamd: processing message <461628246.59720704082024 at melitta.dk> for root:99 and: Aug 17 14:39:59 z9m9z spamd[13032]: mkdir /root/.spamassassin: Permission denied at /usr/lib/perl5/vendor_perl/5.8.8/Mail/SpamAssassin.pm line 1536 Aug 17 14:39:59 z9m9z spamd[13032]: locker: safe_lock: cannot create tmp lockfile /root/.spamassassin/auto-whitelist.lock.z9m9z.htt-consult.com.13032 for /root/.spamassassin/auto-whitelist.lock: Permission denied Aug 17 14:39:59 z9m9z spamd[13032]: auto-whitelist: open of auto-whitelist file failed: locker: safe_lock: cannot create tmp lockfile /root/.spamassassin/auto-whitelist.lock.z9m9z.htt-consult.com.13032 for /root/.spamassassin/auto-whitelist.lock: Permission denied So over at spamassassin list I was told not to let spamassassin run as root. To create a user: spamfilter. and add -u spamfilter to the start command. So I created the user and group. I ran the spamassassin --lint and -D --lint Then I went to /etc/rc.d/init.d/spamassassin and change the lines: # Set default spamd configuration. SPAMDOPTIONS="-d -c -m5 -H" SPAMD_PID=/var/run/spamd.pid to # Set default spamd configuration. SPAMDOPTIONS="-u spamfilter -d -c -m5 -H" SPAMD_PID=/var/run/spamd.pid And then did: /etc/rc.d/init.d/spamassassin restart and spamassassin is still running as root and I am still getting these errors....