I am using RH80 , sendmail 8.12.5

My server deliver mail to other smtp server.

The authentication is done and there is no error for it.

but all mail thru smtp server return back as ---------
------------------------
The original message was received at Sat, 31 May 2003 17:47:00 +0530 from dineshmills.com [200.0.0.17]


----- The following addresses had permanent fatal errors ----- <[EMAIL PROTECTED]>
(reason: 550 5.7.1 Unable to relay for [EMAIL PROTECTED])


  ----- Transcript of session follows -----
... while talking to [203.90.66.90]:
DATA
<<< 550 5.7.1 Unable to relay for [EMAIL PROTECTED]
550 5.1.1 <[EMAIL PROTECTED]>... User unknown
<<< 554 5.5.2 No valid recipients

---------------------------

Reporting-MTA: dns; dineshmills.com
Received-From-MTA: DNS; dineshmills.com
Arrival-Date: Sat, 31 May 2003 17:47:00 +0530

Final-Recipient: RFC822; [EMAIL PROTECTED]
Action: failed
Status: 5.7.1
Remote-MTA: DNS; [203.90.66.90]
Diagnostic-Code: SMTP; 550 5.7.1 Unable to relay for [EMAIL PROTECTED]
Last-Attempt-Date: Sat, 31 May 2003 17:47:58 +0530
------------------------------
The original message was received at Sat, 31 May 2003 17:42:23 +0530 from dineshmills.com [200.0.0.17]


----- The following addresses had permanent fatal errors ----- <[EMAIL PROTECTED]>
(reason: 550 5.7.1 Unable to relay for [EMAIL PROTECTED])


  ----- Transcript of session follows -----
... while talking to [203.90.66.90]:
DATA
<<< 550 5.7.1 Unable to relay for [EMAIL PROTECTED]
550 5.1.1 <[EMAIL PROTECTED]>... User unknown
<<< 554 5.5.2 No valid recipients

----------------
Reporting-MTA: dns; dineshmills.com
Received-From-MTA: DNS; dineshmills.com
Arrival-Date: Sat, 31 May 2003 17:42:23 +0530

Final-Recipient: RFC822; [EMAIL PROTECTED]
Action: failed
Status: 5.7.1
Remote-MTA: DNS; [203.90.66.90]
Diagnostic-Code: SMTP; 550 5.7.1 Unable to relay for [EMAIL PROTECTED]
Last-Attempt-Date: Sat, 31 May 2003 17:43:29 +0530

---------------------

Direct delivery also cause some problem like 2 out of 10 message will reture with above error.

What could be the reason.

Nilesh

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