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Having recently deleted an Exchange 2007 User from AD we found a number of bounce back emails beginning to occur. The bounce backs would occur primarily on editing Calender items for other users as the now deleted user was still listed as a Delegate for them. We wanted to query Exchange as to which mailboxes the now deleted user was listed on. The bounce back email is below:

Delivery has failed to these recipients or distribution lists:

Username
The recipient’s e-mail address was not found in the recipient’s e-mail system. Microsoft Exchange will not try to redeliver this message for you. Please check the e-mail address and try resending this message, or provide the following diagnostic text to your system administrator.

FIX:

1. Open Exchange 2007 PowerShell
2. Run the below query replacing $User with the name of the deleted user (e.g John Smith). This will output the details into a text file (C:\delegates.txt).

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