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Exchange unable to send email to one particular domain

Posted on 2003-11-20
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Last Modified: 2008-02-01
what could be the problem if my exchange server unable to send message to one particular domain. Every place else it can send without any problem.

here is what my users are getting message when the try to send email to that domain.

*********************************************************************
This is a delivery status notification, automatically generated by MTA problemdomain.com on Tue, 1 Nov 2003 10:12:42 -0600 (EST)
Regarding recipient(s) : useratproblemdomain@problemdomain.com
Delivery status : Failed. Did not receive the expected protocol response.
(mydomain.com).
We have been attempting delivery for 5 times.  Maximum delivery tries attempted. Please contact your administrator to contact the destination domain or resend your message. Delivery failed.
Message Information:
Sender     : useratproblemdomain@problemdomain.com
Recipient  : myuser@mydomain.com
MTA Response :4.4.1
The original message headers are included as attachment.
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Question by:sqazi786
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Expert Comment

by:BygRob
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Go to www.dnsstuff and troubleshoot that domain.  
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Icetoad earned 125 total points
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do this if you can ping their mail server, use bygrob's website to find out the mail servers actual name:

C:\telnet problemdomain.com 25  

At a command prompt, if you dont get an answer, then their server might be down.  If you do get an answer, try to send an email manually.

mail from: user@yourdomain.com
rcpt to: user@problemdomain.com
data
asdfasdfasdfasdf
.

if that gets thru then your server has some settings issues.
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