tion Again, congratulations to you, Mr. Miller – good luck and good wishes on your new position as Director of Marketing Department . Cordially yours, Thomas Jiang General Manager Sample plimentary Close Body Signature Social Communication The definition of a congratulation letter A letter of congratulation, or a congratulations letter, is a thoughtful way to deliver a congratulatory message to friends or family members or business partners, commemorating plishments and achievements. It is used both in personal and business situations. Certain types of congratulation letters are also referred to as “ commendation letters ” in some situations. Summary