In message <200611012132.kA1LWNde027489@toad.rmkhome.com>, Rick Kelly writes:
>Is anyone doing greylisting with postfix? It looks like there is nothing
>but the undocumented postgrey out there. I installed the package and
>got /usr/pkg/sbin/postgrey and a message that says:

I am using sqlgrey.  1.7.3 works okay, BUT, it sometimes hangs or quits.
My solution (which sucks badly) is to run it in daemon mode, so I can ask
it to restart every five minutes, which seems to DWIM.

>And that's it. No docs. No indication on how to configure it in postfix.

Google up sqlgrey.  Works very well, apart from the "sometimes goes away",
which I solved with a cron job.  (Every 5 minutes is overkill, but I'd rather
have minimal downtime in the event that the crash is random, not something
that happens only after a certain amount of uptime or load.)

Worth it, too; think "90% reduction in spam".

-s