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why is user getting a Delivery status notification relay message?

When a customer of ours sends email to us they are now getting a delay messages and then it eventually times out.  I can see the messages in the smtp logs and the recipient gets a Delivery Status Notification (Relay) message.  However, the recipient never gets the message?  The messages never show up in the message tracking center but I can see them in the smtp logs?  This is Exchange 2003
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AIT
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AIT
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1 Solution
 
zelron22Commented:
Do you have the text of the NDR that they're getting?
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AITAuthor Commented:
The following recipients could not be reached:
username on date
Could not deliver the message in the time limit specified. Please retry or contact your administrator
<theirdomain  #4.4.7>

This is just the timeout from retries on their end.  Its strange I see the messsages in the smtp logs, but our recipient only gets the relay message and not the email itself. The messages dont show up in the tracking center
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zelron22Commented:
Have you checked the resolution in this article?

http://support.microsoft.com/kb/329636
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AITAuthor Commented:
Our mail goes to them fine.  Its when they send to us.  
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zelron22Commented:
Sorry about that.  You're talking about the Exchange SMTP logs?  Or do you have an SMTP gateway such as Symantec's SMTP gateway?
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AITAuthor Commented:
yes.  I can see activity in smtp logs on the exchange server.  when the mail comes from this domain our exchange server will send a relay message to our recipient.  However, the mail itself is not delivered.  Yes, we have an email gateway which happens to be symantec but I can see the messages on the exchange server which means they are beyone the gateway
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SurajCommented:
okk.. good that you are aware of the Log...
do one thing...
ENABLE NCSA LOG on the default smtp virtual server...
restart the smtp service

test mail again...

and attach the ncsa log here... i will read that and let u know

-x
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AITAuthor Commented:
I got all of his responses late last night.  The other thing, we can telnet into their mail server, they cant telnet by name or IP into ours.  If its still happening, I'll enable that logging.  thanks
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SurajCommented:
If they are not able to telnet to yours on port 25 then.. i guess... port 25 is blocked some where,.... can be your firewall....
you can see the logs on the firewall too...

do message tracking on the server and see if it shows anything coming in
i am sure you won't...
this will prove you that if the issue is with our exchagne server or somethng on the network,...

How does your Inbound mail work ?

Internet--> firewall --> spam box --> exch ??

what is your domain name.. let me try to do a telnet to your mx and see what i get....

-X
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AITAuthor Commented:
this is the only place we are having this issue from, we get all other internet mail.  We get a ton of mail from all over.  Our mail goes to an ironport and then we have symantec for exchange on the server itself.  its mail.aitworldwide.com
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SurajCommented:
Just contact Iron port and check if they are bolcking them...
they will have some logs at their end... which will give u more information...

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