Exchange 5.5 Sp4 immediate NDR for specific domains

Posted on 2003-10-28
Last Modified: 2010-03-05
When users attempt to send email to anyone at our Exchange server immediately reply’s to the in-house user with a System Administrator report with the following info.  It seems to reply so quickly that it doesn’t even have a chance to hit the earthlink mail server.

Could the reply happen this quickly if our company domain is on a black hole list for earthlink?  The reason I ask is because a year ago we had an open relay for about a week but like I said that was a year ago.

 Your message did not reach some or all of the intended recipients.

      Subject:      FW: Email test to Desiree
      Sent:      10/28/2003 8:21 AM

The following recipient(s) could not be reached:

      '' on 10/28/2003 8:21 AM
            Unable to deliver the message due to a communications failure
      The MTS-ID of the original message is: c=US;a= ;p=xxxxxxxxxxxx;l=MAIL_SERVER-031028162101Z-75
Question by:johnm07
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Accepted Solution

JasonBigham earned 250 total points
ID: 9635493
Can you do a DNS lookup and return MX records for earthlink?  

If so, then (from the mail server) please click start, run, and type telnet earthlinkmxrecord 25


Author Comment

ID: 9635868

I havent done this in awhile but I thinik I did it right.

After getting the IPs for the earthlink mail servers I tried a tracert to and the IP was resolved to  I then tried a tracert to and it resolved

From my exchange server I followed your instructions and telnetted to " 25"  and received the following:
220 penguin EL_3_9_10 /EL_3_9_10  ESMTP EarthLink SMTP Server Tue, 28 Oct 2003 1
0:34:36 -0800 (PST)

What do ya think?
Default Server:

> set type=mx

Non-authoritative answer:   MX preference = 5, mail exchanger =   MX preference = 5, mail exchanger =   MX preference = 5, mail exchanger =   MX preference = 5, mail exchanger =   MX preference = 5, mail exchanger =   MX preference = 5, mail exchanger =   MX preference = 5, mail exchanger =   MX preference = 5, mail exchanger =   MX preference = 5, mail exchanger =   MX preference = 5, mail exchanger =   MX preference = 5, mail exchanger =   nameserver =   nameserver =   nameserver =      internet address =      internet address =      internet address =      internet address =      internet address =      internet address =      internet address =      internet address =      internet address =      internet address =      internet address =       internet address =

Expert Comment

ID: 9635889
Let's finish the telnet process to see if there is more info. That's just the greeting.


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Author Comment

ID: 9636075

Sweet, that’s the answer I have been looking for. I had called earthlink probably 10 times or more and was never able to get a response as to why their users couldn’t accept email from our domain. I even asked them to check their black hole list but now I at least know why.  Now I'll need to write asking to be removed from their open relay list but at least I have their mail servers telnet reply’s.   Nice work Jason!!!

This is the first time I have used Experts Exchange, what a great introduction and what a great resource.

220 penguin EL_3_9_10 /EL_3_9_10  ESMTP EarthLink SMTP Server Tue, 28 Oct 2003 1
0:55:38 -0800 (PST)
250 penguin Hello [], please to meet you
mail from
550 Dynamic IPs/open relays blocked. Contact <>.

Expert Comment

ID: 9636135
Glad to here... make sure you aren't an open relay as well... though it may have been an error on their part.

Expert Comment

ID: 9636143
And welcome Experts Exchange... don't forget to accept an answer.

Author Comment

ID: 9636223

Quick followup question, does it matter which of your 4 replys I press accept on?

Thanks agin!

Expert Comment

ID: 9636233
Try and accept the one you felt to be most helpful... this helps others to quickly locate the answer in the future.

Expert Comment

ID: 11225710
I am having the same problem.  Did you e-mail  If so what did you say to get removed and how long did it take?


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