Rob Arista:
> Heya.
>
> I've had a really simple Postfix server running for a couple of
> months. I managed to get a decent hang of smtpd_*_restrictions and
> been rejecting a bunch of spam. Not enough though so I'm looking to
> do some more protection.
>
> I've been reading about AddOns, and the lots of available ProxyFilters
> and Milters.
>
> I printed out and read the SMTPD_PROXY_README and MILTER_README
> how-tos. Lots of info, but I got different ones working ones working
> one at a time on a test box.
Allow me to repeat the HTML/ASCII art in Postfix documentation.
The before-queue filter model is:
smtpd -> before queue filter -> smtpd -> cleanup -> queue
The Milter filter model for SMTP submission is:
smtpd+smtpd_milters -> cleanup -> queue
Where smtpd gives the SMTP commands to the Milter, and where cleanup
gives the header and body to the Milter.
To combine the two models:
smtpd -> before queue filter -> smtpd+smtpd_milters -> cleanup -> queue
Wietse
