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Exchange 2000 SMTP Delivery Delay to Remote Destinations

Posted on 2006-04-10
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Last Modified: 2011-10-03
One of my clients is running single instance of Exchange 2000 on a W2K server.  This morning, the Exchange server crashed due to a HD becomming full.  Prior to the crash, it was functioning perfectly.  The hard drive became full because one workstation was submitting about 50 requests per second for Windows Updates (SUS had previously been installed on this server), and the IIS log files used up all of the available drive space.  We were able to resolve the SUS problem, and clean up the hard disk.  After a server reboot, it appeared as though everything was functioning perfectly.

They are able to send and receive internal mail without difficulty, and are able to *receive* SMTP mail without difficulty.  However, all *outbound* SMTP messages are being delayed about 30 minutes before delivery.  No settings on the Exchange server have been changed, and DNS appears to be functioning properly.

Any help would be appreciated.

...Tim
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Question by:TAgee_ATS
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Bembi earned 2000 total points
ID: 16422753
Would say, there maybe a bottleneck on your internet connection. Have a look at your mail headers to see the difference between sending and receiving mails. If your SUS is quite fresh, it will download a few Gigs of Updates, dependend on your configuration settings. This may take a while.

You can temporary stop the SUS service to see, if something changes. Also have a look at the settings for the virtual smtp server, how long the time is set to resend waiting mails.

Some other reasons may be:
- Heavy processor load
- Less memory
- low disk space (you should have more than 100 MB free).

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by:TAgee_ATS
ID: 16422905
Bembi...the Internet connection appears to be fine.  They have a full T1 that is not being taxed too heavily.  They are also no longer using SUS.  Free disk space is > 25 GB.  I'll check on processor and memory stats.
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Expert Comment

by:Bembi
ID: 16422955
As you said, the mails will be delayed, have also a look on the mails within the queue. You can open the queue and then search for mails and then open the mails. There is usually a reason at the bottom of the dialog.
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