Spamd uses a lot less system resources than invoking spamassassin, but if
one doesn't have root access it's tricky to keep it up and running across
reboots and so forth. Here's a procmail recipe to automatically start up
spamd when it's needed.
# Avoid filtering anything already tagged, just as a precaution
:0
* ! ^X-Spam-Status: Yes
{
# I recommend uncommenting this until you've seen a few messages go
# through the whole process successfully.
#VERBOSE=yes
# Here we check whether spamd is running. The large score short-circuits
# the second test when killall succeeds. Otherwise we start up spamd and
# if that succeeds, it's OK to pipe to spamc.
#
# If killall -0 isn't supported, -1 is OK, spamd won't exit on HUP. If
# killall doesn't work at all, use spamd -d -r $HOME/spamd.pid ... and
# kill -1 `cat $HOME/spamd.pid`, but starting a shell and two processes
# is pretty expensive and we want a fast cheap test here.
#
# Port 7726 because on your telephone keypad that spells SPAM. :-)
# If more than one user is trying this on the same host, they'll each
# have to choose their own port number (e.g. base it on your UID).
#
# You may need to tweak the -F value, and it's probably OK to drop -P.
#
:0fw
* 9876543210^0 ? killall -0 spamd
* 9876543210^0 ? spamd -d -p 7726 -F 1 -P
| spamc -p 7726
# This is "failsafe" code which only runs if spamd can't be run.
# Strip "X-Spam-Status: No" if it appears in the incoming message.
# This can be commented out in most cases if the above is working.
:0Efhw
| spamassassin -d
# If we didn't make it through spamc, go through spamassassin instead.
# This can be commented out in most cases.
:0fw
* ! ^X-Spam-Status:
| spamassassin -P
#VERBOSE=no
}
This could be simplified if spamc would report somehow that it has failed
to make a connection to spamd.
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