After setting up Cal.com on custom domain and booking a meeting, neither sides get any email only a booking on google calendar for the receiver. But on reschedule or cancellation an email is sent from name@customdomain.com to the scheduler only which is quite strange. The issue is probably because I haven't set anything email related in the .env. Am I supposed to fill them up or should I be able to get an email like cancellations and reschedules?