What punctuation mark is used after a salutation?

The punctuation mark used after a salutation depends on the type of letter or message you are writing:

* Formal letters: A colon (:) is used after the salutation.

* Informal letters and emails: A comma (,) is used after the salutation.

Examples:

* Formal Letter:

* Dear Mr. Smith:

* Informal Letter or Email:

* Dear John,