sending mail from unix is failing

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# 1  
Old 01-21-2008
sending mail from unix is failing

i am sending mails from my unix server to my mail id
i used sendmail option
previously it ran successfully
now it is not sending mails
what might be the problem

this is the message i am getting in /var/mail/abcdev file

how to rectify this?

----- The following addresses had permanent fatal errors -----

----- Transcript of session follows -----
550 5.1.2 <>... Host unknown (Name server: host not found)

Content-Type: message/delivery-status

Reporting-MTA: dns;
Received-From-MTA: DNS; localhost
Arrival-Date: Sun, 20 Jan 2008 22:50:42 -0600 (EST)

Final-Recipient: RFC822;
Action: failed
Status: 5.1.2
Remote-MTA: DNS;
Last-Attempt-Date: Sun, 20 Jan 2008 22:58:12 -0600 (EST)

Content-Type: message/rfc822

Return-Path: <>
Received: from (localhost [])
by (8.13.8+Sun/8.13.8) with ESMTP id m0L4ogsT023727
for <>; Sun, 20 Jan 2008 22:50:42 -0600 (CST)
Received: (from abcdev@localhost)
by id m0L4ogIU023726;
Sun, 20 Jan 2008 22:50:42 -0600 (CST)
Date: Sun, 20 Jan 2008 22:50:42 -0600 (CST)
From: APPLN IOP Dev id <>
Message-Id: <>
Content-type: text/html
Subject: SUCCESS: abc Report Creation Process for 20080120
# 2  
Old 01-21-2008
try the following:

telnet <your mailserver> 25
mail from:
rcpt to:<some hotmail email address>

then run command mailq on the server to see if mails are going out

simulataeously on your mailserver tail -f /var/log/syslog | grep darthvader

and check hotmail to see if the email from darthvader has reached

if you telnet <mail server> 25

and get an immediate "closed connection" something somewere is blocking, check with networks or firewall admins
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