How to disable the Encrypt-Only feature in Outlook

Applies to: Outlook 2016


In Microsoft Outlook for Office 365, when the new Office 365 Message Encryption Capabilities feature is enabled, Encrypt-Only is added as a new ad-hoc template. Encrypt-Only enables message encryption without rights restrictions. This article describe how to disable the Encrypt-Only option in Outlook. 

For more information about the feature, see Encrypt-Only option for emails

More information

You can disable the Encrypt-Only option on the Encrypt list without also disabling Message Classification. To do this, apply the following registry key.

  1. In Registry Editor, locate and select the following registry subkey: 

  2. On the Edit menu, point to New, and then select DWORD (32-bit) Value.
  3. Type DisableEO, and then press Enter.
  4. In the Details pane, right-click DisableEO, and then select Modify.
  5. In the Value data box, type 1, and then select OK.
  6. On the Edit menu, point to New, and then select String Value.
  7. Type DefaultPermissionTemplateGuid, and then press Enter.
  8. In the Details pane, right-click DefaultPermissionTemplateGuid, and then select Modify.
  9. In the Value data box, type irmdnf, and then select OK.
  10. Exit Registry Editor.