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How to stop "RESOLVER.ADR.ExRecipNotFound; not found ##" bouncbacks

The CEO is getting these errors as he has sent emails to several users and included a user no longer in the company (Meaning that email no longer exists) But he still from time to time received emails from exchange (Bounce backs). How can I get it to stop? Its emails that were sent months ago and he is still getting these bounce backs below?

From: Microsoft Outlook <MicrosoftExchange329e71ec88ae4615bbc36ab6ce41109e@Abc.com<mailto:MicrosoftExchange329e71ec88ae4615bbc36ab6ce41109e@Abc.com>>
Date: November 8, 2013 at 2:11:23 PM EST
To: <WMM@Abc.com<mailto:WAM@Abc.com>>
Subject: Undeliverable: FW: NMHC Update: New White Paper Outlining Key Copyright and Music Licensing Principles Available


Delivery has failed to these recipients or groups:

JOHN SMITH<mailto:IMCEAEX-_O%3DTHE%2B20ABC_OU%3DEXCHANGE%2B20ADMINISTRATIVE%2B20GROUP%2B20%2B28FYDIBOHF23SPDLT%2B29_CN%3DRECIPIENTS_CN%3DJSMITH@Abc.com>
The e-mail address you entered couldn't be found. Please check the recipient's e-mail address and try to resend the message. If the problem continues, please contact your helpdesk.


Diagnostic information for administrators:

Generating server: DH8.Abc.com<http://DH8.Abc.com>

IMCEAEX-_O=THE+20ABC_OU=EXCHANGE+20ADMINISTRATIVE+20GROUP+20+28FYDIBOHF23SPDLT+29_CN=RECIPIENTS_CN=JSMITH@Abc.com<mailto:IMCEAEX-_O=THE+20ABC_OU=EXCHANGE+20ADMINISTRATIVE+20GROUP+20+28FYDIBOHF23SPDLT+29_CN=RECIPIENTS_CN=JSMITHJ@Abc.com>
#550 5.1.1 RESOLVER.ADR.ExRecipNotFound; not found ##

Original message headers:

Received: from DH8.Abc.com<http://DH8.Abc.com> ([fe80::8818:8e72:ebe0:ca46%13])  by DH8.Abc.com<http://DH8.Abc.com> ([fe80::8818:8e72:ebe0:ca46%13]) with  Microsoft SMTP Server id 14.01.0355.002; Fri, 8 Nov 2013 14:11:23 -0500
Content-Type: application/ms-tnef; name="winmail.dat"
Content-Transfer-Encoding: binary
From: "WMM" <WMM@Abc.com<mailto:WMM@Abc.com>>
To: SS <ss@Abc.com<mailto:smorris@Abc.com>>, JOHN SMITH
        <IMCEAEX-_O=THE+20ABC_OU=EXCHANGE+20ADMINISTRATIVE+20GROUP+20+28FYDIBOHF23SPDLT+29_CN=RECIPIENTS_CN=JSMITH@Abc.com<mailto:IMCEAEX-_O=THE+20ABCOU=EXCHANGE+20ADMINISTRATIVE+20GROUP+20+28FYDIBOHF23SPDLT+29_CN=RECIPIENTS_CN=JSMITH@Abc.com>>
Subject: FW: NMHC Update: New White Paper Outlining Key Copyright and Music  Licensing Principles Available
Thread-Topic: NMHC Update: New White Paper Outlining Key Copyright and Music  Licensing Principles Available
Thread-Index: AQHO3LZQEm6q9mpxHUihVhzwon9iMQ==
References: <0.0.0.66.1CEDCB5F8516826.273FD@mail78.magnetmail.net<mailto:0.0.0.66.1CEDCB5F8516826.273FD@mail78.magnetmail.net>>
In-Reply-To: <0.0.0.66.1CEDCB5F8516826.273FD@mail78.magnetmail.net<mailto:0.0.0.66.1CEDCB5F8516826.273FD@mail78.magnetmail.net>>
X-MS-Has-Attach:
X-MS-Exchange-Inbox-Rules-Loop: wmm@abc.com<mailto:wmm@abc.com>
X-MS-TNEF-Correlator: 823646ce-2101-4f49-9521-600e43752066
MIME-Version: 1.0
Date: Fri, 8 Nov 2013 14:11:23 -0500
Message-Id: <288009d0b57f418d83076e518d982256@DH8.Abc.com<mailto:288009d0b57f418d83076e518d982256@DH8TYDN1-VS2.Abc.com>>
Avatar of Simon Butler (Sembee)
Simon Butler (Sembee)
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You can't stop them, other than telling users to stop sending to invalid addresses.
There isn't a way to stop Exchange from generating them.

The most common reason for this error is auto complete information being used - so clearing out the entries from there would probably help.

Simon.
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IT_Fanatic

ASKER

That's the thing.  The user does not send emails to this user.  These messages are coming from emails that were sent a while back from what he says.  I've deleted the users email from his contacts so he does not select it by mistake
That can only mean it is a delegate somewhere and needs to be tracked down.

Simon.
Any ideas on how to accomplish this?
User the message tracking tool on Exchange and specify the failed recipients' email address and a date range overlapping the times that the emails were sent so then you should pickup who sent it.

N.B. Don't enter anything under the sender's email address.
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