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Date: Wed, 13 Jun 2007 12:04:40 +0800
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To: Olivier Nicole <on@cs.ait.ac.th>
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Cc: freebsd-questions-local@be-well.ilk.org, freebsd-questions@freebsd.org
Subject: Re: Shorten delay in sending mail to SMTP
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Thanks Nicole. This may end up as a qmail question now: is there a way 
to disable dns lookup for qmail then?

Olivier Nicole wrote:
>> Can anyone confirm that Qmail/ inetd/ FreeBSD does some form of dns 
>> lookup on it's SMTP?
>>     
>
> It most certainly does, that would be configurable, but you can
> confirm that by yourself: look at the full headers of the email you
> receive, you should see some headers saying something like:
>
> Received: from mx2.freebsd.org (mx2.freebsd.org [69.147.83.53])
> 	by mail.cs.ait.ac.th (8.13.1/8.12.11) with ESMTP id l5CFXURR030909
> 	for <on@cs.ait.ac.th>; Tue, 12 Jun 2007 22:33:34 +0700 (ICT)
>
> Now consider the top most of the Received-by headers, this top most
> one has been generated by your qmail server. Does it have an IP
> address associated to the the name of the sending machine
> (mx2.freebsd.org [69.147.83.53])? If yes, it means qmail did some DNS
> resolving.
>
> bests,
>
> Olivier
>