i am using RHEL5 .
i configured DNS Server and also sendmail server in on sys.

i am configure Forwordzone like this
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$TTL 86400
@ IN SOA server1.manam.com. root.manam.com. (
42 ; serial (d. adams)
3H ; refresh
15M ; retry
1W ; expiry
1D ) ; minimum

IN NS server1.example.com.
server1.manam.com. IN A 192.168.10.254
@ IN MX 1 server1.manam.com.
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When we send a mail the like user@manam.com then this error is coming

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Date: Fri, 6 Mar 2009 00:12:46 +0530
From: Mail Delivery Subsystem <MAILER-DAEMON@server1.manam.com>
To: <phani@server1.manam.com>
To: postmaster@server1.manam.com
Subject: Returned mail: see transcript for details
Auto-Submitted: auto-generated (failure)

[-- Attachment #1 --]
[-- Type: text/plain, Encoding: 7bit, Size: 0.3K --]

The original message was received at Fri, 6 Mar 2009 00:12:45 +0530
from localhost [127.0.0.1]

----- The following addresses had permanent fatal errors -----
<gopi@manam.com>

----- Transcript of session follows -----
554 5.0.0 MX list for manam.com. points back to server1.manam.com
554 5.3.5 Local configuration error

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help me to do this

You should add your domain in /etc/mail/local-host-names

give one example plz

Open /etc/mail/local-host-names with your favorite editor and add a line containing manam.com. Save the file and restart sendmail.

thank you sir.

that is done.Now sendmail properly working