Cannot email to old user account

Getting an error when sending an email to an older user account we reset the password for. Bounced email inbound and outbound. I cannot delete this user out of AD, or Exchange.

Generating server: VHUB.company.edu

IMCEAEX-_O=COMPANY_OU=EXCHANGE+20ADMINISTRATIVE+20GROUP+20+28FYDIBOHF23SPDLT+29_CN=RECIPIENTS_CN=Virginia+20Reyesd26@company.edu
#550 5.1.1 RESOLVER.ADR.ExRecipNotFound; not found ##

Original message headers:

Received: from EXMBXT.company.edu ([::1]) by VHUB.company.edu
 ([fe80::9cc6:8f9c:b556:cd5%10]) with mapi id 14.02.0298.004; Tue, 26 Mar 2013
 10:34:24 -0700
Content-Type: application/ms-tnef; name="winmail.dat"
Content-Transfer-Encoding: binary
From: Ryan Graves <rgraves@company.edu>
To: Vicky Reyes <vreyes2@company.edu>
Subject: Test
Thread-Topic: Test
Thread-Index: Ac4qSDOOxai/Ulu2TI2oJldCB8YINg==
Date: Tue, 26 Mar 2013 10:34:24 -0700
Message-ID: <882F181AA831B845ACB005632D71879178C2E857@ExMBXT.company.edu>
Accept-Language: en-US
Content-Language: en-US
X-MS-Has-Attach:
X-MS-TNEF-Correlator: <882F181AA831B845ACB005632D71879178C2E857@ExMBXT.company.edu>
MIME-Version: 1.0
X-Originating-IP: [172.16.4.158]

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