[Your letterhead, if desired; if not, your return address]
[Date of letter-month, day, and year]
[Recipient's first and last names]
[Company name]
[Street or P.O. box address]
[City, State ZIP code]
Dear [recipient's name]:
Richard and I just want to wish both you and Jeffrey a very Happy Anniversary! How exciting that you are celebrating your 19th anniversary on Thursday. The years sure do fly by, and it has been a privilege for us to know both of you and your children for so long.
We would love to take you out to dinner next week to celebrate your anniversary, so please let me know which day would work with your busy schedule. Once again, we hope both you and Jeffrey have a wonderful anniversary!
Sincerely,
[Signature]
[Sender's first and last names]