[Mimedefang] Accept mail before processing

Jan Pieter Cornet johnpc at xs4all.nl
Tue Mar 14 17:42:56 EST 2006

On Tue, Mar 14, 2006 at 10:39:58PM +0100, Jan Pieter Cornet wrote:
> Same here. Our outgoing servers are doing virus scanning (using
> 3 different scanners), and from/to address verification before
> accepting the email, all with negligible delays (on average
> around 900 msec for all of this).

I lied, I was thinking about a recent setup where we accidentally
did 6x over virus scanning, which is slighly excessive.

It's 450 msec on average per email now, I just verified it in the logs
again. Virus scanners take around 100 msec each, the from/to address
verification takes slightly longer because of DNS lookups. Less than
half a second is apparently good enough for the outlook users, as I
haven't heard any complaints about that part.

Then again, the "throw enough hardware at it" goes for us too. Currently
using 17 intel dual xeon 2.8GHz machines with 4G RAM each, with hardware
RAID 2x SATA disks for around a 2.5 million messages/day.

One very important thing to do in these days, is to separate your
incoming and outgoing mail servers, even if you're a small shop
and one box could handle it.

The hardware is cheap enough, and you will earn that investment back
with the time saved in the ease of configuration, because the two
servers will need quite different configurations.

Jan-Pieter Cornet <johnpc at xs4all.nl>
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