456, X Street, Y Avenue
[Subject: Normally bold, summarizes the intention of the letter] -Optional-
Dear ANDREW HALL,
I write on behalf the Gander Association, and wish to thank you for all of your assistance with our recent fundraiser. We have found ourselves short of donations in recent months and had received an increase in demand for our services. Your assistance in broadcasting our appeal has seen our message reach many more people than we have ever been able to before. The broadcast has allowed us to bring in more funds than ever before.