Joseph Hall
1902, X Street, Madison Avenue,
Los Angeles, CA-90001
(123) 456-7890
[Subject: Normally bold, summarizes the intention of the letter] -Optional-
Dear Joseph hall,
I have just learnt that you have become to engaged to Robert. Congratulations! It has always seemed destined that you were to be together. I offer my wholehearted best wishes for a long and very happy marriage.
Sincerely,
Jonathon