There some customers who are very particular with security and compliance or rights management service. They also would wish to hide all default RMS templates such as, contoso.com – confidential, contoso.com – confidential (View Only) and Do Not Forward, and have their own. Thus, it is easy to hide the contoso.com – confidential and contoso.com – confidential (View Only) templates using the Azure classic portal. However, based on many article I researched on hiding or disable the “Do Not Forward” permission in the Outlook have said “You cannot hide or remove Do Not Forward because it is based on the Office”. So, I came by this article (Reference: https://support.microsoft.com/en-gb/help/2458423/the-message-classification-feature-is-unavailable-when-you-disable-the) to resolve this hiding of “Do Not Forward” feature by modifying the registry of the Office. This method applies to version of Outlook 2010 to Outlook 2016 and can also done via GPO.
Modify using registry;
- Open Registry edit (regedit.exe) > HKEY_CURRENT_USER > Software > Microsoft > Office > 16.0 > Common > DRM
- Create a new > DWORD(32bit)
- Name the registry: DisableDNF
- Double click on the registry > enter value ‘1’
- Close the registry
- Close and relaunch the Outlook
After relaunch the Outlook, you could see whether the given method works is creating a new email > options > permission toggle, the “Do Not Forward” has grey out or disable.