We use CodeTwo to manage company email signatures, but users can still open Outlook's Insert > Signature menu, edit the inserted signature, and change its fonts or formatting. I tried disabling signatures with Set-OwaMailboxPolicy -Identity "OwaMailboxPolicy-Default" -SignaturesEnabled $false, but it didn't appear to change anything. Is there a way to completely remove or disable the native signature button in the ribbon for new messages?
1 Answer
You can disable native signatures through the Office policy setting called “Do Not Allow Signatures for e-mail messages.” You may also need to disable signatures in the relevant Outlook on the web mailbox policy with Set-OwaMailboxPolicy and the SignaturesEnabled setting. CodeTwo also provides an option to disable Outlook’s built-in signatures, so that configuration is worth checking as well.
We already enabled CodeTwo’s setting, but it is being ignored because we use combination mode. CodeTwo explained that once a client-side signature is inserted into the message body, users can edit it because it is just message content. The signature is applied again when another new message or reply is created. To prevent edits completely, the supported approach is to stop using client-side signatures and use server-side, or cloud, signatures instead. Those are added after the message is sent, so users cannot modify them in Outlook.