Scenario
You want to prioritize signatures deployed by the Outlook Add-in by removing the built-in signatures options from Outlook on the Web (OWA).
Resolution
You can remove the built-in signatures options from OWA by disabling the feature in the OWA mailbox policy in Exchange Online.
WARNING! Disabling the signature options will stop users from creating or modifying signatures in OWA; however, existing signatures will not be removed. Microsoft does not currently provide any way for admins to delete the users roaming signatures. Existing signatures will still show up in OWA when the feature is disabled.
Please click on the required options listed below to go through the detailed description:
To disable signatures in Outlook on the Web
-
Navigate to https://admin.exchange.microsoft.com/#/owapolicies.
- Select the OWA policy. The details of the selected policy are displayed on the right-hand side.
Example: -
Under Features, click Manage Features.
-
Expand the User experience drop-down, and untick Email signature.
- Click Save changes.
To disable signatures for all mailboxes' in Outlook on the Web
- Open a PowerShell window and connect to Exchange Online.
- Run the following command to disable Outlook Web signatures from all mailboxes:
set-OwaMailboxPolicy * -SignaturesEnabled $false