I've just watched the Indonesian Open's mixed double final between Chinese Zheng/Ma VS Korean Lee/Lee. In one occasion when Zheng served the shuttle high to Lee HJ, the shuttle after flying past the net was obviously flying outside the reception's court area. I think Lee intercepted the shuttle where the point of contact was IMO outside her court area. Zheng's serve was immediately called fault by the umpire. I wonder what went wrong. Unfortunately no explanation from the TV commentator. So can anyone verify that a serve has to fly within the intended reception court area even in mid air as soon as it passes the opponent's front service line? In other words, the serve cannot come in from out of bound. I have actually observed such occasion several times in doubles' games, but checking with the official badminton rules come to avail. I had played a casual double game where one player loves to serve near the side of his court and serve the shuttle flying past his opposite court area before landing in his diagonally opposite court area. This service style rendering the reception in a very awkward situation. When I tried to tell him the serve is illegal, he said the rules didn't say that!