Austin Parker,
1234, West 67 Street,
Carlisle, MA 01741,
(123)-456 7890
[Subject: Normally bold, summarizes the intention of the letter] -Optional-
Dear Austin Parker,
Thank you very much for the dinner invitation on Saturday night at 8:30 p.m. Please inform us whether it alright if we get something. Diana and I have always enjoyed the parties that you throw. We very much look ahead to being there.
Sincerely,
Wichert