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Consider the following. You have an Exchange 2003 environment. Users are getting the following message from the Exchange PostMaster account on meeting updates or meeting cancelations they sent to recipients outside your exchange organization.
Subject: Delivery Status Notification (Delay)
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.
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All recipient addresses check good. You check the Outgoing SMTP Queue on the Exchange Server the users mailbox is hosted on and notice the users message is there with a red dot on the envelope icon indicating delivery has thus far failed and a retry is scheduled.
Normal messages and initial meeting requests go thru to the same outside recipients with no problem. The same outside recipients can accept the meeting request and the sender recieves the accept message.
Then after the meeting update or cancelation sent by the internal user expires in the queue the user will recieve the following NDR message from the system Administrator on the same meeting update or meeting cancelation they sent to recipients outside your exchange organization.
Subject: Undeliverable: Delivery Status Notification (Failure)
Your message did not reach some or all of the intended recipients.
Subject: [Subject of Message]
The following recipient(s) cannot be reached:
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on 4/8/2010 8:48 AM
Could not deliver the message in the time limit specified. Please retry or contact your administrator.
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on 4/8/2010 8:48 AM
Could not deliver the message in the time limit specified. Please retry or contact your administrator.
Recommendation:
Check if the external recipients messaging system is Exchange 2007 or Exchange 2010. If so refer to this Microsoft Knowledgebase Article.
http://support.microsoft.com/kb/938650
"A meeting update message or a meeting cancellation message from an Exchange 2003 user is not delivered to an Exchange 2007 user"
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