IMC Message delivery problem

[Gersen]

howdy all,

Been struggling with an odd problem. We are running Exchange 5.5 SP4, on a Windows 2000 domain controller. This setup has been working fine since I upgraded the DC to Win 2000 a couple of months ago.

Starting yesterday (Wed) some of our outgoing e-mail won't deliver, and some will. Strangely enough, some will deliver to a specific domain, and others to the SAME ADDRESS won't! When we send one of the messages that fails, I get an event in the log that indicates a successful TCP connection the the host, then after a minute another event indicating the connect attempt failed.

Two people sent a message simultaneously to the same address, and one generated 2 events: successful connection and successful delivery. The other generated 2 events: successful connection and failed attempt to connect...

We use a variety of Outlook versions, but I haven't seen a correlation between this problem and the version of Outlook. Seems like that shouldn't make a difference anyway, since the outgoing message is "packaged" by the Exchange Server.

I can RESTEST any domain successfully on the Exchange Server.

I hope someone has seen something like this before. I've been plugging away for hours and I am stumped. All input will be appreciated, and if more info on our setup would help, please ask.

Thanks,

Jim Peterson

 

[Gersen]

Ok, I have new information to add. It seems the problem is limited to certain users and certain Outlook installs, apparently Outlook 2002. There is one very baffling problem I'm looking at right now. One of my users tried to reply to an e-mail to confirm a newsletter subscription. It did not go through. If I try to send it, logged on as me, the message goes through. Here's the Exchange SMTP log, and I send first (JPeterson) and you can see it complete. Then the user (NDingle) tries to send and after the "DATA" prompt - nothing. We get an event in Event Vwr that the connection attempt fails! Exactly the same SMTP session, as far as I can tell, but mine goes and his stops. Here's the transcript:
=====================================================

(my attempt)

4/11/2003 10:40:54 AM : A connection to 64.62.164.181 was established.
4/11/2003 10:40:54 AM : <<< IO: |220 nl-mail1.internet.com ESMTP
|
4/11/2003 10:40:54 AM : <<< 220 nl-mail1.internet.com ESMTP
4/11/2003 10:40:54 AM : >>> EHLO PSION.PROSOL-INC.COM

4/11/2003 10:40:54 AM : <<< IO: |250-nl-mail1.internet.com
250-PIPELINING
250 8BITMIME
|
4/11/2003 10:40:55 AM : <<< 250-nl-mail1.internet.com
250-PIPELINING
250 8BITMIME

4/11/2003 10:40:55 AM : >>> MAIL FROM:<JPETERSON@PROSOL-INC.COM>

4/11/2003 10:40:55 AM : <<< IO: |250 ok
|
4/11/2003 10:40:55 AM : <<< 250 ok
4/11/2003 10:40:55 AM : >>> RCPT TO:<c-1822-48d6fd0436@nl.internet.com>

4/11/2003 10:40:55 AM : <<< IO: |250 ok
|
4/11/2003 10:40:55 AM : <<< 250 ok
4/11/2003 10:40:55 AM : >>> DATA

4/11/2003 10:40:55 AM : <<< IO: |354 go ahead
|
4/11/2003 10:40:55 AM : <<< 354 go ahead
4/11/2003 10:40:55 AM : <<< IO: |250 ok 1050076439 qp 10650
|
4/11/2003 10:40:55 AM : <<< 250 ok 1050076439 qp 10650
4/11/2003 10:40:55 AM : >>> QUIT

4/11/2003 10:40:55 AM : <<< IO: |221 nl-mail1.internet.com
|
4/11/2003 10:40:55 AM : <<< 221 nl-mail1.internet.com


(user's attempt)

4/11/2003 10:40:56 AM : A connection to 64.62.164.181 was established.
4/11/2003 10:40:56 AM : <<< IO: |220 nl-mail1.internet.com ESMTP
|
4/11/2003 10:40:56 AM : <<< 220 nl-mail1.internet.com ESMTP
4/11/2003 10:40:56 AM : >>> EHLO PSION.PROSOL-INC.COM

4/11/2003 10:40:56 AM : <<< IO: |250-nl-mail1.internet.com
250-PIPELINING
250 8BITMIME
|
4/11/2003 10:40:56 AM : <<< 250-nl-mail1.internet.com
250-PIPELINING
250 8BITMIME

4/11/2003 10:40:56 AM : >>> MAIL FROM:<NDINGLE@PROSOL-INC.COM>

4/11/2003 10:40:56 AM : <<< IO: |250 ok
|
4/11/2003 10:40:56 AM : <<< 250 ok
4/11/2003 10:40:56 AM : >>> RCPT TO:<c-1822-48d6fd0436@nl.internet.com>

4/11/2003 10:40:56 AM : <<< IO: |250 ok
|
4/11/2003 10:40:56 AM : <<< 250 ok
4/11/2003 10:40:56 AM : >>> DATA

4/11/2003 10:40:56 AM : <<< IO: |354 go ahead
|
4/11/2003 10:40:56 AM : <<< 354 go ahead
4/11/2003 10:42:18 AM : 499 Host unreachable: nl.internet.com. Message subject: &quot;&quot;RE: PocketPC Wire Subscription Confirmation Needed&quot;&quot;. Rescheduling delivery for later.
========================================================

Anyone have ANY input on what could be doing this?? I'm starting to tear my hair out...


thanks

 

[Gersen]

ok, thanks for the input.