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This e-mail message cannot be delivered to Email because the email-address is no longer valid

Posted on 2014-04-17
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Last Modified: 2014-04-21
Hello,

We have recently replaced a Windows 2008 SBS (Exchange 2007) with a new server Windows 2012 (Exchange 2013).

All users are experiencing problems when they attempt to reply to [internal] emails submitted prior to the migration.

Message is:
This e-mail message cannot be delivered to %Email% because the e-mail address is no longer valid.

This is creating major havoc.  Any assistance would be greatly appreciated.

Regards,
Real-Timer
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Question by:realtimer
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Jamie McKillop earned 2000 total points
ID: 40007454
Hello,

This issue you are experiencing is due to the way Exchange routes email internally and is explained in my article here - http://www.experts-exchange.com/Software/Server_Software/Email_Servers/Exchange/A_9650-NDRs-and-the-legacyExchangeDN.html

To resolve the issue, you will need to create new X500 addresses on your mailboxes that match the old legacyExchangeDN values.

-JJ
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