Microsoft KB Archive/280765

= Error message: This e-mail address already exists in this organization =

Article ID: 280765

Article Last Modified on 10/25/2007

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APPLIES TO


 * Microsoft Exchange Server 2003 Enterprise Edition
 * Microsoft Exchange Server 2003 Standard Edition
 * Microsoft Exchange 2000 Server Standard Edition

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This article was previously published under Q280765



SYMPTOMS
When you create a new user in the Active Directory Users and Computers snap-in and add an address in the Create Exchange Mailbox box, you may receive the following error message:

This e-mail address already exists in this organization.

No: c10312e7



CAUSE
This issue can occur if an object in Active Directory already has the address that you are attempting to add to the user's e-mail addresses list.



RESOLUTION
To resolve this issue, use either of the following methods:

Method One

 * 1) Start the Exchange System Manager.
 * 2) Click to expand the Recipients container.
 * 3) Right-click All Address Lists, point to New, and then click Address List.
 * 4) Click the Filter Rules button and verify that it is set to Exchange Recipients (the default setting).
 * 5) Click the Advanced tab, click Field, and then click User.
 * 6) Click E-mail Address.
 * 7) In the Condition box, click Starts with, and then in the empty box to the right, type the first few letters of the address that you want to search for.
 * 8) Check the lower window for matches.

If you find objects that have the same e-mail address as the one you are trying to add, either change the e-mail address for this object or delete the address if it is longer needed.

Repeat the same process for public folders, contacts and groups, but use the following modifications:
 * 1) In step 5, point to User, and then change the setting to Public Folder, to Contact, or to Group.
 * 2) In step 6, click E-mail Address or Alias if the E-mail Address option is not available.

Method Two
If you have completed method one, and you did not find an e-mail address that is the same as the address that you want to add, use Network Monitor to do a trace between the Exchange computer and a workstation that has System Manager tools and Active Directory tools installed.  Start the Network Monitor trace. Go to the workstation and re-create the error message. Stop the Network Monitor trace. Click Capture, and then scroll down to display the captured data. Click Display, click Filter, and then double-click Protocol. Click Disable all, and then in the right column, click to enable LDAP.</li> Click OK twice.</li> Look for a SearchRequest entry that has a detail window which lists the LDAP: Attribute Type. Under LDAP: Attribute Type, the following value is displayed:

LDAP: Attribute Value = SMTP: @ .com

This is the address that you are trying to add to the user.</li> Go to the next pane in the Summary window. A SearchResponse entry is displayed which reports the object that owns the e-mail address in question. This information is found under: LDAP: ProtocolOP: SearchResponse. Expand the container until you find the following value:

LDAP: Attribute Value = CN=, CN= , DC=

This object location owns the e-mail address in question.</li> Find this object in the Active Directory Users and Computers snap-in, and then change the e-mail address or delete this object if it is no longer needed.</li></ol>

<div class="moreinformation_section">

MORE INFORMATION
For more information, click the following article number to view the article in the Microsoft Knowledge Base:

148942 How to capture network traffic with Network Monitor

In some scenarios, such as an ASP hosting scenario, there may be a need to create mail-enabled contacts in different OUs that have a common SMTP alias. EXAMPLE: CompanyA and CompanyB, both customers of an ASP, have their own address lists and cannot view the other customers' address lists. Both these companies have a common client, with common contact information. Using Active Directory Users and Computers, they cannot both create a contact with the same SMTP alias.

To resolve this, do not create the contact with Active Directory Users and Computers, but use the ADSIedit MMC snap-in or ADSI scripting (potentially from a web-based interface) to carry out this task. The fields to modify are &quot;mail&quot;, &quot;proxyAddress&quot;, and &quot;targetAddress&quot;. Those fields can be modified to enter SMTP aliases that exist for other contacts in other OUs without error.

Additional query words: smtp fails exch2kp2w XADM

Keywords: kberrmsg kbprb KB280765

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