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Postfix, spamc per-user, with aliases?
From: Gerald Turner <gturner_at_nospam>Date: Sat May 21 2011 - 20:13:20 GMT
To: users@spamassassin.apache.org
Hello,
I'm using a Postfix after-queue configuration very close to what is
documented on the SpamAssassin wiki[1]. Works great with mail where
localpart matches a user, but doesn't work so great for aliases. I'm
using the spamc -u argument so that each user has their own prefs,
bayes, awl, etc., master.cf will fallback to 'nobody' if setuid fails
(in the case of an alias), and there will be a few harmless errors and
spamassassin will still get the job done with system-wide default
behavior.
Looks like Postfix alias lookup is only handled by local(8) and not
something accessible to pipe(8). The only foreseeable option is to
duplicate the lookup in a shell script, which isn't pretty because I'm
using a combination of aliases db and LDAP.
Anyone have experience with this?
Example fallback messages when using an alias:
spamd: connection from localhost [127.0.0.1] at port 49244
spamd: handle_user unable to find user: 'admins'
spamd: still running as root: user not specified with -u, not found, or set to root, falling back to nobody
spamd: processing message <XYZ> for admins:65534
auto-whitelist: open of auto-whitelist file failed: locker: safe_lock: cannot create lockfile /nonexistent/.spamassassin/auto-whitelist.mutex: No such file or directory
spamd: clean message (-0.1/3.0) for admins:65534 in 1.7 seconds, 2879 bytes.
spamd: result: . 0 - AAA,BBB scantime=1.7,size=2879,user=admins,uid=65534,required_score=3.0,rhost=localhost,raddr=127.0.0.1,rport=49244,mid=<XYZ>,autolearn=no,shortcircuit=no
prefork: child states: IIIII
... then pickup/qmgr/local take over and 'admins' is expanded to the
real user(s)
Configuration:
main.cf:
spamc_destination_recipient_limit = 1
master.cf:
smtp inet n - - - 20 smtpd
-o content_filter=spamc
spamc unix - n n - 5 pipe
flags=u user=nobody argv=/etc/postfix/spamc-filter -u ${user}
-e /usr/sbin/sendmail -oi -f ${sender} ${recipient}
spamc-filter:
#!/bin/sh
(/bin/cat | /usr/bin/spamc -x $@) || {
echo spamc exit code $? 1>&2
exit 75
}
[1] http://wiki.apache.org/spamassassin/IntegratedSpamdInPostfix
-- Gerald Turner Email: gturner@unzane.com JID: gturner@unzane.com GPG: 0xFA8CD6D5 21D9 B2E8 7FE7 F19E 5F7D 4D0C 3FA0 810F FA8C D6D5