The inside address. In a business letter the inside address is the address of the person written to. In personal letter the inside address is usually omitted.
In a business letter it is always correct to use a personal title with the name of the person addressed. A business title should not precede the name. Correct personal titles are: Mr., Mrs., Miss, Dr., Professor, Messrs., е.g. Dr. Т. С Howard
Superintendent of Schools
The Greeting. The following forms are correct for business and professional letters:
Gentlemen: Ladies:
Dear Sir: Dear Madam:
My dear Sir. My dear Madam:
Dear Mr. Warren: Dear Miss Howard:
In personal letters either a colon or a comma may be used after the greeting. A comma is considered less formal. In personal letters the range of greetings is unlimited and informal, like "My own Lovey-Dovey" of Judy's "Dear Daddy Long-Legs".
