Autoreplies to Calendar users for booked Rooms in Reservations db - where do they come from?

I’ve created a Room Reservations database that has custom code restricting how much booking time a single user can have per day. In order for the system to work, I’m trying to prevent the bookings of rooms in this particular Reservations database from the Notes and iNotes Calendar.

I’ve created an agent that runs “Before New Mail Arrives” to delete any messages coming into the R&R DB, and return a message to the sender to say that they can’t book a room through the Calendar - they must book in the DB directly. All of this works well - the Reservation is never recorded, and the time for the room still appears free.

The problem is that the user still receives an “Accepted” or “Declined” message from the Room itself. Where are these messages coming from? I can’t see any code in the Room Reservations database that can be triggering the messages. Are they coming from busytime.nsf?

I’m going crazy trying to prevent messages that say the Reservation is accepted, when in fact it isn’t. I want to turn off all autoreplies from this particular R&R DB - any ideas?

Many thanks,

Karen