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 ( [])
        by (8.13.1/8.12.11) with ESMTP id l5CFXURR030909
        for <[EMAIL PROTECTED]>; 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
( [])? If yes, it means qmail did some DNS



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