Recive email policy for localhost domain

Hi all 

I have a UNIX machine with sendmail daemon. trying to send email for my exchange mailbox getting error:

From MAILER-DAEMON@centOS.tc.intranet  Wed May 29 21:48:46 2013
Return-Path: <MAILER-DAEMON@centOS.tc.intranet>
Received: from localhost (localhost)
        by centOS.tc.intranet (8.13.8/8.13.8) id r4TImkEZ021109;
        Wed, 29 May 2013 21:48:46 +0300
Date: Wed, 29 May 2013 21:48:46 +0300
From: Mail Delivery Subsystem <MAILER-DAEMON@centOS.tc.intranet>
Message-Id: <201305291848.r4TImkEZ021109@centOS.tc.intranet>
To: <root@centOS.tc.intranet>
MIME-Version: 1.0
Content-Type: multipart/report; report-type=delivery-status;
        boundary="r4TImkEZ021109.1369853326/centOS.tc.intranet"
Subject: Returned mail: see transcript for details
Auto-Submitted: auto-generated (failure)

This is a MIME-encapsulated message

--r4TImkEZ021109.1369853326/centOS.tc.intranet

The original message was received at Wed, 29 May 2013 21:48:46 +0300
from localhost.localdomain [127.0.0.1]

   ----- The following addresses had permanent fatal errors -----
<mc@mydomain.com>
    (reason: 550 5.1.8 <root@centOS.tc.intranet>: Sender address rejected: Domain not found)

   ----- Transcript of session follows -----
... while talking to smtp.ldc.net.:
>>> RCPT To:<mc@mydomain.com>
<<< 550 5.1.8 <root@centOS.tc.intranet>: Sender address rejected: Domain not found
550 5.1.1 <mc@mydomain.com>... User unknown

--r4TImkEZ021109.1369853326/centOS.tc.intranet
Content-Type: message/delivery-status

Reporting-MTA: dns; centOS.tc.intranet
Received-From-MTA: DNS; localhost.localdomain
Arrival-Date: Wed, 29 May 2013 21:48:46 +0300

Final-Recipient: RFC822; mc@mydomain.com
Action: failed
Status: 5.1.1
Remote-MTA: DNS; smtp.ldc.net
Diagnostic-Code: SMTP; 550 5.1.8 <root@centOS.tc.intranet>: Sender address rejected: Domain not found
Last-Attempt-Date: Wed, 29 May 2013 21:48:46 +0300

--r4TImkEZ021109.1369853326/centOS.tc.intranet
Content-Type: message/rfc822

Return-Path: <root@centOS.tc.intranet>
Received: from centOS.tc.intranet (localhost.localdomain [127.0.0.1])
        by centOS.tc.intranet (8.13.8/8.13.8) with ESMTP id r4TImkEZ021107
        for <mc@mydomain.com>; Wed, 29 May 2013 21:48:46 +0300
Received: (from root@localhost)
        by centOS.tc.intranet (8.13.8/8.13.8/Submit) id r4TImkR7021106
        for mc@mydomain.com; Wed, 29 May 2013 21:48:46 +0300
Date: Wed, 29 May 2013 21:48:46 +0300
From: root <root@centOS.tc.intranet>
Message-Id: <201305291848.r4TImkR7021106@centOS.tc.intranet>
To: mc@mydomain.com
Subject: The test subject

TTTTTTTTTT

--r4TImkEZ021109.1369853326/centOS.tc.intranet--

From MAILER-DAEMON@centOS.tc.intranet  Wed May 29 21:55:04 2013
Return-Path: <MAILER-DAEMON@centOS.tc.intranet>
Received: from localhost (localhost)
        by centOS.tc.intranet (8.13.8/8.13.8) id r4TIt4S0021422;
        Wed, 29 May 2013 21:55:04 +0300
Date: Wed, 29 May 2013 21:55:04 +0300
From: Mail Delivery Subsystem <MAILER-DAEMON@centOS.tc.intranet>
Message-Id: <201305291855.r4TIt4S0021422@centOS.tc.intranet>
To: <root@centOS.tc.intranet>
MIME-Version: 1.0
Content-Type: multipart/report; report-type=delivery-status;
        boundary="r4TIt4S0021422.1369853704/centOS.tc.intranet"
Subject: Returned mail: see transcript for details
Auto-Submitted: auto-generated (failure)

This is a MIME-encapsulated message

--r4TIt4S0021422.1369853704/centOS.tc.intranet

The original message was received at Wed, 29 May 2013 21:55:03 +0300
from localhost.localdomain [127.0.0.1]

   ----- The following addresses had permanent fatal errors -----
<mc@mydomain.com>
    (reason: 550 5.1.8 <root@centOS.tc.intranet>: Sender address rejected: Domain not found)

   ----- Transcript of session follows -----
... while talking to smtp.ldc.net.:
>>> RCPT To:<mc@mydomain.com>
<<< 550 5.1.8 <root@centOS.tc.intranet>: Sender address rejected: Domain not found
550 5.1.1 <mc@mydomain.com>... User unknown

--r4TIt4S0021422.1369853704/centOS.tc.intranet
Content-Type: message/delivery-status

Reporting-MTA: dns; centOS.tc.intranet
Received-From-MTA: DNS; localhost.localdomain
Arrival-Date: Wed, 29 May 2013 21:55:03 +0300

Final-Recipient: RFC822; mc@mydomain.com
Action: failed
Status: 5.1.1
Remote-MTA: DNS; smtp.ldc.net
Diagnostic-Code: SMTP; 550 5.1.8 <root@centOS.tc.intranet>: Sender address rejected: Domain not found
Last-Attempt-Date: Wed, 29 May 2013 21:55:04 +0300

--r4TIt4S0021422.1369853704/centOS.tc.intranet
Content-Type: message/rfc822

Return-Path: <root@centOS.tc.intranet>
Received: from centOS.tc.intranet (localhost.localdomain [127.0.0.1])
        by centOS.tc.intranet (8.13.8/8.13.8) with ESMTP id r4TIt3S0021420
        for <mc@mydomain.com>; Wed, 29 May 2013 21:55:03 +0300
Received: (from root@localhost)
        by centOS.tc.intranet (8.13.8/8.13.8/Submit) id r4TIt38C021419
        for mc@mydomain.com; Wed, 29 May 2013 21:55:03 +0300
Date: Wed, 29 May 2013 21:55:03 +0300
From: root <root@centOS.tc.intranet>
Message-Id: <201305291855.r4TIt38C021419@centOS.tc.intranet>
To: mc@mydomain.com
Subject: The test subject

TTTTTTTTTT

--r4TIt4S0021422.1369853704/centOS.tc.intranet--