Andrew Lentvorski wrote:
I am in the process of moving from my old mail server to my new mail
server (FreeBSD/Postfix/Courier to OpenSolaris/Postfix/Dovecot --
transition story for another day when it isn't quite so traumatic).
So, I set up the new one as a secondary MX.
And almost 1/3 of my spam changed over.
Okaaaay. Well, at least I know the new server is running.
So, that brings up an interesting question.
Is there any system to use attempts to scan/access a secondary MX as a
way to blacklist hosts?
At Greenest Host, I implemented the following. It proved very effective
at decreasing the amount of Spam. We did not have a secondary MX, but
one of the links below includes a method for systems using secondary MX.
In my case I used Cyrus SASL, but I understand Dovecot is easier.
Maybe some of this you've already done.
Implement the suggestions found in this article (which includes some of
the things in the following links).
http://www.freesoftwaremagazine.com/articles/focus_spam_postfix/
Setup a local blacklist using rbldns:
http://tqmcube.com/rbldnsd.php
Implement an after-queue content filter using AVG (or other filtering SW)
http://www.postfix.org/FILTER_README.html
In addition, ASK (Active Spam Killer) is very effective at eliminating
spam. I know a lot of people don't like these types of systems, but they
work.
http://a-s-k.sourceforge.net/
I plan to implement most, if not all, of these when I get my new hosting
server setup soon.
PGA
--
Paul G. Allen, BSIT/SE
Owner, Sr. Engineer
Random Logic Consulting Services
www.randomlogic.com
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