For a printed business letter, put their contact info in the top right, and address them with their title and surname, followed by a colon. For example,
Professor Thorne:
President Kennedy:
Father Milligan:
Ms Helgastottir:
Showcasing the brazen and nouveau in English communication.
For a printed business letter, put their contact info in the top right, and address them with their title and surname, followed by a colon. For example,
Professor Thorne:
President Kennedy:
Father Milligan:
Ms Helgastottir: