Hi @Dana269 🙂
You can use the special made airbnb mail created for the purpose. You can find it next to the guest profil picture in the reservation if I remember correctly. You can also when using the airbnb app apply photos etc. I have made a welcome and direction guide. The guest gets it automatically when the booking is made but I also add it to the greating message I send in the airbnb message system. I prefer to keep all communication with in the airbnb message system in case I need help from airbnb. And it has actually happend that I needed airbnb to be able to read a meesage feed between me and a guest. Best, Sandra