Dear Doctor Ben Corliss
After the salutation of a business letter, the correct punctuation to use is a colon.
To Whom It May Concern:
Date, salutation, body, closing, enclosure
Dr. and Mr. Steve Smith
Dear Mr. President is a salutation of a business letter. The salutation goes at the beginning, thus that's how you got Dear.
In a business letter =P
Dr. Ben Corliss
A salutation is an addressing to the person that the letter is addressed to and in a business letter you should always start with "Dear" and then add something like "Sir" or "Madam" immediately after it.
Before the body
salutation
salutation
vmrs