Dear Mr.Donahuue,
Mr. President
Yupp[: Dear Mr. President was written by Pink and Billy Mann.
Write, Dear piano teacher ... or if you know the last name, Dear Mr. (or Mrs.) So and so.
Yes, that's correct.
Dear Dr. & Mrs. Smith
"Dear Both" is not a common or standard salutation in English correspondence. It is best to use traditional salutations such as "Dear Mr./Ms." followed by the recipient's last name for a formal letter.
Date Mr. Harold Happy, Jr. street address city, st zip Dear Harold, OR Date Mr. Harold Happy, Jr. street address city, st zip Dear Mr. Happy, - - -
Dear Mr. Capote was created in 1983.
Dear Mr. Prohack was created in 1949.
Dear Mr. Henshaw was published in 1983.
Dear Mr. Wonderful was created in 1982.
Cher Monsieur is Dear Sir. if you know his name is Dupont, write Cher M. Dupont