To write a good thank you message, start with a greeting, tell the recipient "thank you," and add details about why you're thankful. If you have multiple people to thank, make a list so you don't forget anyone. Send your thank you notes as soon as possible. The right thank you message varies depending on the situation and your relationship to the recipient.
A simple, traditional greeting includes the salutation "dear" followed by the name of the recipient. If you are close to the recipient, use a less formal greeting. For professional relationships, stick to a traditional one. Make sure to spell the recipient's name correctly.
There are a variety of ways to say "thank you," such as by saying how grateful you are or that the recipient improved your day. Describe in detail what the recipient's gesture meant to you. If the recipient gave you a gift, explain how you plan to use it. If the recipient came to a party of yours, mention how special the party was for you.
Add a personal touch to the message by saying that you're thinking of the recipient and looking forward to seeing him again. When closing the message, use "sincerely" for a traditional valediction or "with love" for a personal one. End the message by signing your name.