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How to turn off e-mail matching for certificates in Outlook

Support for Office 2003 has ended

Microsoft ended support for Office 2003 on April 8, 2014. This change has affected your software updates and security options. Learn what this means for you and how to stay protected.

This article was previously published under Q276597
Important This article contains information about how to modify the registry. Make sure that you back up the registry before you modify it. Make sure that you know how to restore the registry if a problem occurs. For more information about how to back up, restore, and modify the registry, click the following article number to view the article in the Microsoft Knowledge Base:
256986 Description of the Microsoft Windows registry
Summary
When you send a secure message in Microsoft Outlook 2013, Microsoft Outlook 2010, Microsoft Office Outlook 2007, Microsoft Office Outlook 2003, Microsoft Outlook 2002, or in Microsoft Outlook 2000, you may need to use a certificate that does not match your e-mail address. This article describes how to turn off e-mail matching for certificates.
Resolution
You can turn off e-mail address matching for certificates by editing your registry. To do this, follow these steps, as appropriate for the version of Outlook that you are running.

Warning Serious problems might occur if you modify the registry incorrectly by using Registry Editor or by using another method. These problems might require that you reinstall the operating system. Microsoft cannot guarantee that these problems can be solved. Modify the registry at your own risk.

Outlook 2013

  1. Click Start, click Run, type regedit in the Open box, and then click OK.
  2. Locate the following registry key:
    HKEY_CURRENT_USER\SOFTWARE\Microsoft\Office\15.0\Outlook\Security
  3. If a Security registry key does not exist, create a new key. To do this, follow these steps:
    1. Click the following registry key:
      HKEY_CURRENT_USER\SOFTWARE\Microsoft\Office\15.0\Outlook
    2. On the Edit menu, point to New, and then click Key.
    3. Type Security, and then press ENTER.
  4. Right-click the Security key, click New, and then click DWORD Value.
  5. Type SupressNameChecks, and then press ENTER.
  6. On the Edit menu, click Modify.
  7. Type 1, and then click OK.
  8. On the Registry menu, click Exit.

Outlook 2010

  1. Click Start, click Run, type regedit in the Open box, and then click OK.
  2. Locate the following registry key:
    HKEY_CURRENT_USER\SOFTWARE\Microsoft\Office\14.0\Outlook\Security
  3. If a Security registry key does not exist, create a new key. To do this, follow these steps:
    1. Click the following registry key:
      HKEY_CURRENT_USER\SOFTWARE\Microsoft\Office\14.0\Outlook
    2. On the Edit menu, point to New, and then click Key.
    3. Type Security, and then press ENTER.
  4. Right-click the Security key, click New, and then click DWORD Value.
  5. Type SupressNameChecks, and then press ENTER.
  6. On the Edit menu, click Modify.
  7. Type 1, and then click OK.
  8. On the Registry menu, click Exit.

Outlook 2007

  1. Click Start, click Run, type regedit in the Open box, and then click OK.
  2. Locate the following registry key:
    HKEY_CURRENT_USER\SOFTWARE\Microsoft\Office\12.0\Outlook\Security
  3. If a Security registry key does not exist, create a new key. To do this, follow these steps:
    1. Click the following registry key:
      HKEY_CURRENT_USER\SOFTWARE\Microsoft\Office\12.0\Outlook
    2. On the Edit menu, point to New, and then click Key.
    3. Type Security, and then press ENTER.
  4. Right-click the Security key, click New, and then click DWORD Value.
  5. Type SupressNameChecks, and then press ENTER.
  6. On the Edit menu, click Modify.
  7. Type 1, and then click OK.
  8. On the Registry menu, click Exit.

Outlook 2003

  1. Click Start, click Run, type regedit in the Open box, and then click OK.
  2. Locate the following registry key:
    HKEY_CURRENT_USER\SOFTWARE\Microsoft\Office\11.0\Outlook\Security
  3. If a Security registry key does not exist, create a new key. To do this, follow these steps:
    1. Click the following registry key:
      HKEY_CURRENT_USER\SOFTWARE\Microsoft\Office\11.0\Outlook
    2. On the Edit menu, point to New, and then click Key.
    3. Type Security, and then press ENTER.
  4. Right-click the Security key, click New, and then click DWORD Value.
  5. Type SupressNameChecks, and then press ENTER.
  6. On the Edit menu, click Modify.
  7. Type 1, and then click OK.
  8. On the Registry menu, click Exit.

Outlook 2002

  1. Click Start, click Run, type regedit in the Open box, and then click OK.
  2. Locate the following registry key:
    HKEY_CURRENT_USER\SOFTWARE\Microsoft\Office\10.0\Outlook\Security
  3. If a Security registry key does not exist, create a new key. To do this, follow these steps:
    1. Click the following registry key:
      HKEY_CURRENT_USER\SOFTWARE\Microsoft\Office\10.0\Outlook
    2. On the Edit menu, point to New, and then click Key.
    3. Type Security, and then press ENTER.
  4. Right-click the Security key, click New, and then click DWORD Value.
  5. Type SupressNameChecks, and then press ENTER.
  6. On the Edit menu, click Modify.
  7. Type 1, and then click OK.
  8. On the Registry menu, click Exit.

Outlook 2000

  1. Click Start, click Run, type regedit in the Open box, and then click OK.
  2. Locate the following registry key:
    HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Office\9.0\Outlook\Security
  3. If a Security registry key does not exist, create a new key. To do this, follow these steps:
    1. Click the following registry key:
      HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Office\9.0\Outlook
    2. On the Edit menu, point to New, and then click Key.
    3. Type Security, and then press ENTER.
  4. Right-click the Security key, click New, and then click DWORD Value.
  5. Type SupressNameChecks, and then press ENTER.
  6. On the Edit menu, click Modify.
  7. Type 1, and then click OK.
  8. On the Registry menu, click Exit.
More information
When you send an encrypted email message to a recipient, Outlook uses the recipient's certificate to secure the message. If the email address of the contact or recipient is different from the email address that is specified in the recipient's certificate, you receive the following warning:
Encryption Problems

Microsoft Outlook had problems encrypting this message because the following recipients had missing or invalid certificates, or conflicting or unsupported encryption capabilities:

recipient name

Continue will encrypt and send the message but the listed recipients may not be able to read it.

Send UnencryptedContinueCancel
To prevent Outlook from displaying this warning message, apply the registry change described in the Resolution section of this article.
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Properties

Article ID: 276597 - Last Review: 03/25/2013 18:17:00 - Revision: 5.0

Microsoft Outlook 2013, Microsoft Outlook 2010, Microsoft Office Outlook 2007, Microsoft Office Outlook 2003, Microsoft Outlook 2002 Standard Edition, Microsoft Outlook 2000 Standard Edition

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