Problem with Outlook Express talking to sendmail on RedHat 7…

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Author: Sundar Narayanasamy
Date:  
Subject: Problem with Outlook Express talking to sendmail on RedHat 7.1
Hello,

I have been having this problem for quite sometime.That is, whenever I
reply to a mail from Outlook Express, I get the following error

The message could not be sent because one of the recipients was rejected by
the server. The rejected e-mail address was 'plug-
'. Subject 'Re: Adding a third IDE drive in
Linux', Account: 'mail.esaravana.com linux', Server: 'mail.esaravana.com',
Protocol: SMTP, Server Response: '550 5.7.1 <plug-
>... Relaying denied. IP name lookup failed
[192.168.0.83]', Port: 25, Secure(SSL): No, Server Error: 550, Error
Number: 0x800CCC79


The server it is trying to connect to is a RedHat 7.1, sendmail and a Bind
9 DNS, which also gives all my home computers IP address through DHCP
Protocal.

It's not a problem, when I use sylpheed from RedHat 7.2 client.

Any help is appreciated.

Sundar