Mailscanner and DNS

Daniel Maher daniel.maher at
Wed Sep 27 14:06:55 IST 2006

> -----Original Message-----
> From: mailscanner-bounces at [mailto:mailscanner-
> bounces at] On Behalf Of Alex Neuman van der Hans
> Sent: September 26, 2006 9:37 PM
> To: MailScanner discussion
> Subject: Re: Mailscanner and DNS
> >
> >
> No matter how you're doing it, you should still look into installing
> local DNS caching.

To be fair, this isn't a /requirement/, but in a lot of cases it can help speed things up quite a bit.  For example, if you're running your MTA at your office, but your DNS is handled remotely by an upstream ISP, you should really look into a local caching DNS server.

That said, there are certainly instances when running bind on your mail servers isn't necessary.  For example, in our environment, our mail servers are connected via fibre to the same switch as our DNS servers (also fibre).  The additional 2 or 3 milliseconds that it takes to do a DNS lookup via this method are not significant enough to necessitate the local DNS process.

As always, "general rules" are general for a reason - YMMV. :)

 °v°  Daniel Maher
/(_)\ Administrateur Système Unix
 ^ ^  Unix System Administrator
Sentio aliquos togatos contra me conspirare.

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