MX Anti-Spam measures

[cajunman4life]

I'm curious to see what you guys are doing to cut down on spam (if you run your own MX).

I use Postfix as my MTA of choice, and have configured it fairly well to block most "uninvited" mail (not to mention making sure it's not an open relay). I've also employed postgrey and policyd-weight. I'm still debating whether it's bad enough to bring in spamassassin.

So I'm just getting a feel for what you guys are doing to stop spam/viruses at your MX.

[Carpetsmoker]

TMDA works for me:

http://tmda.net/

[cajunman4life]

Thanks Carpetsmoker, I'll look at this as well.

[phoenix]

We use Postfix with a bunch of the *_restrictions options set, along with a handful of RBL checks.

We also use amavisd-new to integrate clamav, spamassassin (with a whole shwack-load of extra plugins), and dspam.

We block about 2 million messages a month using the above, let through about 20 thousand "possible spam" messages, and about 30 thousand clean messages.

For a school district with 50 domains, 1600 staff accounts, and 7500 student accounts.

[cajunman4life]

I looked at amavisd-new, but shied away due to a depends-list the likes of which I haven't seen in a while for something that doesn't require "X"... but that's a poor excuse. I will look again though.

I don't have any concrete numbers right now, but I know the restrictions I have in postfix (RBL checking, etc) along with postgrey and policyd-weight knock off a bunch of bad mail. For right now, with only 5 domains (and a handfull of users on each domain) I'm not concerned. Neither are the users. But, I'm always eyeing the future...