R: Spamassassin Timeout issue.

Martin.Hepworth martinh at solidstatelogic.com
Wed Sep 10 18:56:34 IST 2008

A quick look at the underlying dns protocol will show u why a local caching dns  server will speed up queries over even a server <1ms away, and in practice the results can be dramatic for a system like SA/MS that is quite dns hungry.


-----Original Message-----
From: Chris Sweeney <csweeney at osubucks.org>
Sent: Wednesday, September 10, 2008 6:45 PM
To: MailScanner discussion <mailscanner at lists.mailscanner.info>
Subject: RE: R: Spamassassin Timeout issue.

> Personally, I don't think it is a significant difference either way.
> If, however, you're running an older version of bind or other DNS server
> that doesn't do random ports, and you don't have the luxury of upgrading
> in the immediate future, using opendns as a forwarder will add a layer
> of protection...
It's going to depend on your network path to OpenDNS also.  I personally
have never found it faster to go off network (OpenDNS) then do lookups
myself.  Especially on a mail server since alot of your SPAM comes in
batches the lookups to the same domain are going to much significanly
faster in that respect.

I've tried OpenDNS quite a few times and although its good and it is fast
it has never beat going local in my test enough to increase my traffic
going out/in from the internet.

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