Turn off e-mail matching for certificates in Outlook

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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 Unencrypted, Continue or Cancel

To prevent Outlook from displaying this warning message, apply the registry change described in the following section.

Solution

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.

NOTE: 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

Click Start, click Run, type regedit in the Open box, and then click OK. Locate the following registry key:

HKEY_CURRENT_USER\SOFTWARE\Microsoft\Office\15.0\Outlook\Security

If a Security registry key does not exist, create a new key. To do this, follow these steps:

Click the following registry key:

HKEY_CURRENT_USER\SOFTWARE\Microsoft\Office\15.0\Outlook

  • On the Edit menu, point to New, and then click Key, then type Security, and then press ENTER.
  • Right-click the Security key, click New, and then click DWORD Value.
  • Type SupressNameChecks, and then press ENTER.
  • On the Edit menu, click Modify.
  • Type 1, and then click OK.
  • On the Registry menu, click Exit.

Outlook 2010

Click Start, click Run, type regedit in the Open box, and then click OK. Locate the following registry key:

HKEY_CURRENT_USER\SOFTWARE\Microsoft\Office\14.0\Outlook\Security

If a Security registry key does not exist, create a new key. To do this, follow these steps:

Click the following registry key:

HKEY_CURRENT_USER\SOFTWARE\Microsoft\Office\14.0\Outlook

  • On the Edit menu, point to New, and then click Key.
  • Type Security, and then press ENTER.
  • Right-click the Security key, click New, and then click DWORD Value.
  • Type SupressNameChecks, and then press ENTER.
  • On the Edit menu, click Modify.
  • Type 1, and then click OK.
  • On the Registry menu, click Exit.

Outlook 2007

Click Start, click Run, type regedit in the Open box, and then click OK. Locate the following registry key:

HKEY_CURRENT_USER\SOFTWARE\Microsoft\Office\12.0\Outlook\Security

If a Security registry key does not exist, create a new key. To do this, follow these steps:

Click the following registry key:

HKEY_CURRENT_USER\SOFTWARE\Microsoft\Office\12.0\Outlook

  • On the Edit menu, point to New, and then click Key.
  • Type Security, and then press ENTER.
  • Right-click the Security key, click New, and then click DWORD Value.
  • Type SupressNameChecks, and then press ENTER.
  • On the Edit menu, click Modify.
  • Type 1, and then click OK.
  • On the Registry menu, click Exit.

Outlook 2003

Click Start, click Run, type regedit in the Open box, and then click OK. Locate the following registry key:

HKEY_CURRENT_USER\SOFTWARE\Microsoft\Office\11.0\Outlook\Security

If a Security registry key does not exist, create a new key. To do this, follow these steps:

Click the following registry key:

HKEY_CURRENT_USER\SOFTWARE\Microsoft\Office\11.0\Outlook

  • On the Edit menu, point to New, and then click Key.
  • Type Security, and then press ENTER.
  • Right-click the Security key, click New, and then click DWORD Value.
  • Type SupressNameChecks, and then press ENTER.
  • On the Edit menu, click Modify.
  • Type 1, and then click OK.
  • On the Registry menu, click Exit.

Outlook 2002

Click Start, click Run, type regedit in the Open box, and then click OK. Locate the following registry key:

HKEY_CURRENT_USER\SOFTWARE\Microsoft\Office\10.0\Outlook\Security

If a Security registry key does not exist, create a new key. To do this, follow these steps:

Click the following registry key:

HKEY_CURRENT_USER\SOFTWARE\Microsoft\Office\10.0\Outlook

  • On the Edit menu, point to New, and then click Key.
  • Type Security, and then press ENTER.
  • Right-click the Security key, click New, and then click DWORD Value.
  • Type SupressNameChecks, and then press ENTER.
  • On the Edit menu, click Modify.
  • Type 1, and then click OK.
  • On the Registry menu, click Exit.

Outlook 2000

Click Start, click Run, type regedit in the Open box, and then click OK. Locate the following registry key:

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Office\9.0\Outlook\Security

If a Security registry key does not exist, create a new key. To do this, follow these steps:

Click the following registry key:

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Office\9.0\Outlook

  • On the Edit menu, point to New, and then click Key.
  • Type Security, and then press ENTER.
  • Right-click the Security key, click New, and then click DWORD Value.
  • Type SupressNameChecks, and then press ENTER.
  • On the Edit menu, click Modify.
  • Type 1, and then click OK.
  • On the Registry menu, click Exit.

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