Exchange server giving "Delayed Delivery" message.

All,

Our Exchange 2003 sp2 server is randomly giving users on Outlook the following message

This is an automatically generated Delivery Status Notification.

THIS IS A WARNING MESSAGE ONLY.

YOU DO NOT NEED TO RESEND YOUR MESSAGE.

Delivery to the following recipients has been delayed.

      example@example.com


The recipient immediately get's the email, even though the sender immediately get's a "delay notification."

Any one seen this?
coyotejeffAsked:
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flyingskyConnect With a Mentor Commented:
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coyotejeffAuthor Commented:
Thank you for the article.  Although the symptoms match up perfectly, this article is for Exchange 2000.  That being said I did check the settings described in that article and they all look correct.

Any other ideas?
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coyotejeffAuthor Commented:
I will go through that discussion.  More information--this is happening to multiple domians with great frequency.  I don't think it's anything on the recipients side.  I have also verified that our IP is not blacklisted.  We have multiple offices in the org over a WAN, and none of the other Exchange servers are having this issue.  We do use Postini as a smarthost for outgoing mail in all sites.

Thanks.
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coyotejeffAuthor Commented:
More information.  Even when removing the smart host, I am still getting the Delayed Delivery message.
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coyotejeffAuthor Commented:
So far, it's looking like there was a large amount of network traffic due to viral activity at the site.  The network connection for outgoing mail was crawling.  After cleaning up the network a bit, mail flow seems to have continued without the delay messages.
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