Managing Outlook's default signature options with the Signature 365 Outlook add-in
You are looking to understand the options for setting user signatures using the Signature 365 add-in.
The Signature 365 add-in is configured to set the default internal Outlook signatures to none, and insert the default signature as set in the portal. This is done to ensure that signatures defined for the user in Signature 365 are correctly set, and will always remove a default signature set by the user.
It is possible to configure the behaviour of the add-in to change the behaviour of the auto-insert function, and / or to prevent the internal Outlook default signature being set to none.
Follow these steps to configure this:
- Log on to the Signature 365 portal and open the Outlook Integrations page from Integrations -> Outlook.
- Deselect the Clear Outlook's default signature or Auto-insert signature options as required for your use case.

More information
To remove access to all classic Outlook signature settings, see Managing personal signatures, fonts and stationery for Outlook desktop.
To remove access to signatures for devices using roaming signatures (new Outlook / Outlook on the web), see Disabling Outlook signatures in new Outlook and Outlook on the web.
How to set Outlook default fonts for all users
Use the Symprex Email Signature Utility to set default Outlook messaging fonts for all users with Signature 365.
Managing personal signatures, fonts and stationery for Outlook Classic desktop
Use the Symprex Email Signature Utility to manage Classic Outlook fonts, stationery, and personal signatures on local devices.