Jordan Wolf: List some Do’s of Business Letter

Always keep the language and communication style of your business letter formal.
Follow the prescribed structure for a business letter, as they are not written in the same manner as a personal letter.
Always proofread your letter to ensure that it is free of typographical errors.
Use a formal greeting, but keep the tone professionally friendly.
Always use the last name of the receiver in your salutation.
Be sure to add the date on the letter on which it is composed and sent.
Avoid grammatical errors.
Keep the letter concise and to the point.
Make sure that the letter is clearly written and answers all the possible questions that the receiver may have.
Always sign the letter with blue ink so the original letter can easily be differentiated from a copy.