It's always lovely to receive an email like this:
Thank you so much for photographing our special day. I didn't get a chance to properly thank you on the day. I've had so many people asking me who the photographer was, saying you had done a really good job and organised the families really well on the day, as it's very difficult telling people what to do! But you certainly knew what you were doing and we appreciate that. So thank you very much, I've no doubt the pictures will come out beautifully. I will be sure to recommend you to all my family and friends.