Disable Signature in Outlook (Web and Desktop)

In certain situations, you may wish to disable the ability for users to modify or add a signature in Outlook, especially if you manage signatures via Signitic. Here is how to proceed for Outlook Web App (OWA) and Outlook Desktop.

Disable the signature in Outlook Web App (OWA)

Via the Exchange Admin Center (EAC)

You can disable the signature functionality from the Exchange dashboard:

1. Open the Exchange Admin Center (EAC).

2. Go to Roles > Owa web app policies.

3. Open each relevant policy.

4. Click on Manage Features.

5. Under the User Experience section, uncheck "Email signature".

6. Save the changes.

Via Exchange PowerShell

You may also apply the policy via PowerShell:

Set-OwaMailboxPolicy -Identity "NomDeLaPolitique" -SignaturesEnabled $false

Disable the signature in Outlook Desktop

To disable signatures in Outlook Desktop, you must modify the Windows Registry or use the Local Group Policy Editor.

Method via the Registry Editor:

1. Open Regedit.

2. Navigate to:

   HKEY_CURRENT_USER\Software\Microsoft\Office\<version>\Outlook\Options\Mail

3. Create a new DWORD value named disablesignatures.

4. Set its value to 1.

This will remove the option to create/modify signatures in Outlook Desktop.