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we have use sendmail for sending the mail purpose in suse linux now we have face the problem in outside domain to our domain(irma.ac.in) mail receving problem it get error like
Sorry, I couldn't find a mail exchanger or IP address.
[smoker@kids ~]$ mail -v -s "test" firstname.lastname@example.org
Cc: email@example.com... Connecting to [127.0.0.1] via relay...
220 kids.headru.sh ESMTP Sendmail 8.13.7/8.13.7; Fri, 5 Mar 2010 13:30:59 GMT
>>> EHLO kids.headru.sh
250-kids.headru.sh Hello localhost.localdomain [127.0.0.1], pleased to meet you
250-AUTH DIGEST-MD5 CRAM-MD5
>>> MAIL From:<firstname.lastname@example.org> SIZE=50 AUTHemail@example.com
250 2.1.0 <firstname.lastname@example.org>... Sender ok
>>> RCPT To:<email@example.com>
250 2.1.5 <firstname.lastname@example.org>... Recipient ok
354 Enter mail, end with "." on a line by itself
250 2.0.0 o25DUx6a010706 Message accepted for delivery
email@example.com... Sent (o25DUx6a010706 Message accepted for delivery)
Closing connection to [127.0.0.1]
221 2.0.0 kids.headru.sh closing connection
From MAILER-DAEMON@kids.headru.sh Fri Mar 5 13:31:06 2010
Date: Fri, 5 Mar 2010 13:31:06 GMT
From: Mail Delivery Subsystem <MAILER-DAEMON@kids.headru.sh>
Content-Type: multipart/report; report-type=delivery-status;
Subject: Returned mail: see transcript for details
Auto-Submitted: auto-generated (failure)
This is a MIME-encapsulated message
The original message was received at Fri, 5 Mar 2010 13:30:59 GMT
from localhost.localdomain [127.0.0.1]
----- The following addresses had permanent fatal errors -----
(reason: 550 Address unknown)
----- Transcript of session follows -----
... while talking to mail2.irma.ac.in.:
<<< 550 Address unknown
550 5.1.1 <firstname.lastname@example.org>... User unknown
451 4.4.1 reply: read error from mail2.irma.ac.in.
Reporting-MTA: dns; kids.headru.sh
Received-From-MTA: DNS; localhost.localdomain
Arrival-Date: Fri, 5 Mar 2010 13:30:59 GMT
Final-Recipient: RFC822; email@example.com
Remote-MTA: DNS; mail2.irma.ac.in
Diagnostic-Code: SMTP; 550 Address unknown
Last-Attempt-Date: Fri, 5 Mar 2010 13:31:05 GMT
It's not dns, your mailserver rejected an unknown user.