Sending Emails to Booking.com Guests

Can I send emails from CloudRooms to guests who only have a Booking.com email address?
Where do Booking.com guests receive emails that are sent from CloudRooms?
Booking.com provides a dedicated guest email address that ends with …@guest.booking.com. You can send emails to these guests at any time via CloudRooms.

The message will then appear in the guest’s Booking.com chat conversation.