troubleshooting Question

Sending Response to A Meeting Request goes to A Different E-Mail than the Sender!

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BrainStorming asked on
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I have noticed that one of the users if he sends me a Meeting Request and I send a Resposne after acceting it, the resposne goes to a different e-mail address than than the sender!!

The e-mail address sent to, was an old test ID created for some time but deleted.
so I get the delivery failure error:
Delivery has failed to these recipients or distribution lists:

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

Secondly, if I edit the Reposne before sending it, I can see cleary it has the correct sender's address in the TO: field
and when I checked the user's ID (the sender) object on Active Directory, everything was fine with it..

Any clue?!!

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