[Mimedefang] spamtrap on secondary MX
Graham Dunn
gdunn at inscriber.com
Wed Nov 24 10:54:18 EST 2004
-ray wrote:
>I read an article in SysAdmin that talked about setting up a spamtrap on a
>secondary or tertiary MX box. The box would look like a good MTA, answers
>helo and 'mail from', but on 'rcpt to' always returns "451 Try again
>later". The idea being spammers prefer secondary MX's, but will never try
>again. A legit host that happens to connect will of course try again
>later (hopefully to primary MX). The author claims this reduced spam
>intake by 10%.
>
>Anyone done anything similar? Any thoughts? Seems like a simple way to
>catch a lot of spam...
>
>
>
Check out milter-greylist, (this can be done in mimedefang, but it's a
much more lightweight as a milter). Or any other greylist solution, for
that matter.
It's working quite well. I think there are still some issues that you
hit if you're greylisting millions of entries, but for mid-small
servers, it's quite nice.
--
Graham Dunn, IT Manager Inscriber Technology Corporation
26 Peppler St, Waterloo, ON, CA N2J3C4
519 570 9111 x243
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