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Date: Fri, 29 Apr 2005 12:02:40 -0500
From: Paul Schmehl <pauls@utdallas.edu>
To: Ihsan <ihsan_junaidi@yahoo.com.sg>, freebsd-questions@FreeBSD.org
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Subject: Re: FreeBSD mailing list reverse DNS problem
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--On Friday, April 29, 2005 03:14:36 AM -0700 Ihsan 
<ihsan_junaidi@yahoo.com.sg> wrote:
>
> I've checked and rechecked with internal and external
> name servers which allow foreign queries that my IP is
> resolvable to anggerik.meltechsystems.net (dig -x
> 202.71.100.92) but somehow FreeBSD servers couldn't
> get the reverse information.
>
I checked, and your DNS ids your box as the MX for your domain as well.

The first thing I would do is telnet *from* your mailserver to the FreeBSD 
mailserver and try a manual SMTP session and see what happens.  If you get 
rejected then, you *know* it's a problem with the FreeBSD server.

You probably know this already, but just in case:

% telnet server.freebsd.org 25
HELO meltechsystems.net
MAIL FROM: you@yourdomain
RCPT TO: list@freebsd.org

If all this works, then something else is causing the problem.

Paul Schmehl (pauls@utdallas.edu)
Adjunct Information Security Officer
The University of Texas at Dallas
AVIEN Founding Member
http://www.utdallas.edu