In a business letter =P
A salutation ends with a colon when it is used in a formal or business letter or email. It is commonly used before the body of the message, such as "Dear Mr. Smith:".
a colon
After the salutation of a business letter, the correct punctuation to use is a colon.
A colon should be used after the salutation in a letter using the standard-block style.
salutation
salutation
Note
A business letter's salutation should be followed by a colon. For example, "Dear Mr. Smith:" or "To Whom It May Concern:".
Following the name of the recipient in the salutation
Following the name of the recipient in the salutation
A mixed punctuation style typically uses a colon after the salutation.
Colon