troubleshooting Question

emails from a few specific domains timing out against Exchange 2003

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Hello;

We recently migrated a cleint to SBS 2003 and Exchange. everything is working super, but some users complain that they are not recieving email from a a few specific domains, the bounced email from the original senders say

" **********************************************
    **      THIS IS A WARNING MESSAGE ONLY      **
    **  YOU DO NOT NEED TO RESEND YOUR MESSAGE  **
    **********************************************

The original message was received at Tue, 16 Oct 2007 10:21:53 -0400 fromXXfe01.XX.XXXX[**.**.**.***]

   ----- Transcript of session follows ----- <XXe@cXXX.com>... Deferred
Warning: message still undelivered after 4 hours Will keep trying until message is 5 days old

"

and


"The following recipient(s) could not be reached:

 

  X@XXXX.com on 10/23/2007 5:37 PM

            Could not deliver the message in the time limit specified.  Please retry or contact your administrator.

            < smtp.XXX.com #4.4.7>
"

To me this seemd like a DNS error on the sender's end as it occured a day or so after the migration, but the problem has persisted for 2 weeks now.

all the DNS records, MX, PTR, etc. for the exchange server are correctly entered with their domain registrar who is also their ISP. Its only these few senders from specific domains, one of which is verizon.net, and it seems unlikely that Verizon configured their mail servers wrong or failed to update DNS.

the Exchange installation is basically stock but we are using IMF, set to archive bad mail. a cursory test of turning IMF off had no effect on this issue.

TIA,

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