Business letters are used as formal communications between businesses, employees, managers, clients and prospective clients. Business letters should include the sender's address, date, the recipient's address and the date, among other information, according to Purdue University's Online Writing Lab.
A business letter should open with a salutation after the recipient's address. The salutation should address the recipient as written in the recipient's address. It is best practice to address a specific individual at a company. Include a personal title in the salutation. When writing to a woman, her preferred title should be used. If a woman's preferred title is unknown, it is acceptable to us "Ms."
Block format or modified block format are favored when writing a business letter. Each paragraph should be single spaced and left justified. The body of the letter should open with a friendly opening paragraph, followed by a statement of the point of the letter, background information and supporting details.
The letter's closing should begin at the same vertical point as the date and one line after the last paragraph. Between the closing and the sender's name should be four spaces to allow for a handwritten signature.