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NDR after removing a recreating a mailbox - Exchange 2013.

We are running Exchange 2013 with a Windows 2012 Domain Controller.
The on-premises I.T person did the following:
1.      Created Active Directory account.
2.      Created an Exchange mailbox and associated it with the AD account.
3.      Now, this is where things went awry.  The I.T admin deleted the mailbox, and then created one again.
Now when users email the user, they received an NDR message – please see below.
I know that certain times like this, an X500 address needs to be created or edited, or at least I think that’s the case.
Any suggestions?

From: Microsoft Outlook
Sent: Thursday, March 03, 2016 7:56 AM
To: IT Person
Subject: Undeliverable:

Delivery has failed to these recipients or groups:
John Barnett
The email address you entered couldn't be found. Please check the recipient's email address and try to resend the message. If the problem continues, please contact your helpdesk.

Diagnostic information for administrators:
Generating server: CTC-MAIL-MBX.CTC.local
Remote Server returned '550 5.1.1 RESOLVER.ADR.ExRecipNotFound; not found'
Original message headers:
Received: from CTC-MAIL-MBX.CTC.local ( by
 CTC-MAIL-MBX.CTC.local ( with Microsoft SMTP Server (TLS) id
 15.0.1156.6; Thu, 3 Mar 2016 07:56:06 -0800
Received: from CTC-MAIL-MBX.CTC.local ([fe80::dd7:2c6f:6495:53d5]) by
 CTC-MAIL-MBX.CTC.local ([fe80::dd7:2c6f:6495:53d5%12]) with mapi id
 15.00.1156.000; Thu, 3 Mar 2016 07:56:06 -0800
Content-Type: application/ms-tnef; name="winmail.dat"
Content-Transfer-Encoding: binary
From: IT Person <ITPerson@domain.com>
To: John Barnett <ProblemUser@Domain.com>
Thread-Index: AdF1ZTHl7RzWqpJ0Q+OC6UZcT5m0xg==
Disposition-Notification-To: IT Person <ITPerson@domain.com>
Date: Thu, 3 Mar 2016 07:56:06 -0800
Message-ID: <5d31037d3e9c407cb59b1a9121fb4d87@CTC-MAIL-MBX.CTC.local>
Accept-Language: en-US
Content-Language: en-US
X-MS-TNEF-Correlator: <5d31037d3e9c407cb59b1a9121fb4d87@CTC-MAIL-MBX.CTC.local>
MIME-Version: 1.0
X-MS-Exchange-Transport-FromEntityHeader: Hosted
X-Originating-IP: []
Return-Path: ITPerson@domain.com

Thanks in advance.
ExchangeActive Directory

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8/22/2022 - Mon