This e-mail thanks a gift-giver for the perfect gift.
Just wanted to thank you for the wonderful <name of the gift>. One of the best things about having someone like you in my life is that you know what I like and what I don't. In this case, you got it just right. I plan on enjoying your gift to the fullest, and now I'm faced with a dilemma: What do I get you? I'll have to work long and hard to come up with something that's just as perfect for you. Thanks again. You really made my day.