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 [188.8.131.52])
by mail.cs.ait.ac.th (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
(mx2.freebsd.org [184.108.40.206])? If yes, it means qmail did some DNS
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