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Date: Wed, 13 Jun 2007 09:58:16 +0700 (ICT)
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From: Olivier Nicole <on@cs.ait.ac.th>
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Subject: Re: Shorten delay in sending mail to SMTP
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> 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