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Top Forums UNIX for Dummies Questions & Answers NDR generated by recipient Exchange server complaining about Return DNS Post 302393571 by wbdevilliers on Tuesday 9th of February 2010 06:32:06 AM
Old 02-09-2010
Question NDR generated by recipient Exchange server complaining about Return DNS

Hi guys

We have a client that gets NDR mails when sending emails to the domain "recipient.com"

My client's domain is "client.com"

My Client setup:

Server 2003 Domain
Front end Back end Exchange 2003 Standard SP2
1 Linux Firewall/Router

The NDR contains:

Code:
The following recipient(s) cannot be reached:

      'user@recipient' on 1/22/2010 12:07 PM

            There was a SMTP communication problem with the recipient's email server.  Please contact your system administrator.

            <exchange_primary.client.com #5.5.0 smtp;550 No RDNS entry for 192.168.0.xxx (IP of the Firewall)>

Now I know this error is caused by the fact that we do not have a RDNS entry for the domain/exchange/firewall.

I would like to know where this RDNS entry must be made. The receiving exchange server tries to do a RDNS lookup on the FQDN of the primary exchange server, but this resolves to the Linux Firewall's external IP address.

Where must I make the change then?

I did not set up the environment so not 100% sure.

Thanks
 

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Server::Relay(3pm)					User Contributed Perl Documentation					Server::Relay(3pm)

NAME
Net::SMTP::Server::Relay - A simple relay module for Net::SMTP::Server. SYNOPSIS
use Carp; use Net::SMTP::Server; use Net::SMTP::Server::Client; use Net::SMTP::Server::Relay; $server = new Net::SMTP::Server('localhost', 25) || croak("Unable to handle client connection: $! "); while($conn = $server->accept()) { # We can perform all sorts of checks here for spammers, ACLs, # and other useful stuff to check on a connection. # Handle the client's connection and spawn off a new parser. # This can/should be a fork() or a new thread, # but for simplicity... my $client = new Net::SMTP::Server::Client($conn) || croak("Unable to handle client connection: $! "); # Process the client. This command will block until # the connecting client completes the SMTP transaction. $client->process || next; # In this simple server, we're just relaying everything # to a server. If a real server were implemented, you # could save email to a file, or perform various other # actions on it here. my $relay = new Net::SMTP::Server::Relay($client->{FROM}, $client->{TO}, $client->{MSG}); } DESCRIPTION
The Net::SMTP::Server::Relay module implements simple SMTP relaying for use with the Net::SMTP::Server module. All this module does is to take a given message and iterate through the list of recipients, doing DNS lookups for the associated MX record and delivering the messages. This module makes extensive use of the plethora of other modules already implemented for Perl (specifically the DNS and Net::SMTP modules in this case), and should give but a glimpse of the potential for extending the Net::SMTP::Server's functionality to provide a full-featured SMTP server, native to Perl. The above example illustrates the use of the Net::SMTP::Server::Relay modules -- you simply have to instantiate the module, passing along the sender, recipients, and message. More formally: $relay = new Net::SMTP::Server::Relay($from, @to, $msg); Where $from is the sender, @to is an array containing the list of recipients, and $msg is the message to relay. AUTHOR AND COPYRIGHT Net::SMTP::Server / SMTP::Server is Copyright(C) 1999, MacGyver (aka Habeeb J. Dihu) <macgyver@tos.net>. ALL RIGHTS RESERVED. You may distribute this package under the terms of either the GNU General Public License or the Artistic License, as specified in the Perl README file. SEE ALSO
Net::SMTP::Server::Server, Net::SMTP::Server::Client perl v5.10.1 1999-12-28 Server::Relay(3pm)
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