Blue Prism provides a certified interface if you need ot use a Microsoft Exchange email service - the Blue Prism Mapiex interface. This interface does require Outlook to be installed on the PC.
The Mapiex interface and its instructions/guide should be available to whoever in your organisation has access to the main product installer. That person will either have access to the Mapiex installer in the product releases/add ons area of the portal, or should be able to request access to it if is not there (via their usual release request or mentor channels).