Suppress duplicate confirmation email when booker and guest share the same email address.

As a property manager, I want the system to send only one confirmation email when the guest and booker are the same person, so that guests do not receive duplicate emails for the same reservation.

Current behaviour

When a reservation is created in Mews Operations or via the Mews Open API, and the same person is linked as both guest and booker (identical email address), Mews sends two separate emails: one guest confirmation and one booker confirmation. The guest receives the same email twice.
Expected behaviour

When the guest and booker profiles share the same email address, only one email should be sent — the guest confirmation. The booker confirmation should be automatically suppressed.
Why this matters

Duplicate emails degrade the guest experience and reduce trust in the property's communication. The issue affects all reservations created via Mews Operations and via the Open API, where the booker/guest relationship is set programmatically and cannot be manually overridden at send time.
Proposed solution

Introduce a configurable option at service level (Settings → Services → Options) to suppress the booker confirmation email when the booker and guest email addresses are identical.