What are the doubles tennis serving rules?

In doubles tennis, the serving rules require the server to stand behind the baseline and alternate serving between the two players on the serving team. The server must serve diagonally across the court to the opponent's service box. The server must also wait for the receiver to be ready before serving and must serve within the service box. If the serve hits the net and lands in the correct service box, it is considered a let and the server gets another chance to serve.