How To Properly Write A Letter Head . All formal letters start with the contact information and date. The address it the first piece of information you need to know when learning how to write a letter to mail. You Can See This Valid Proper Letter format and Spacing At http from www.pinterest.jp Typically, the letterhead is placed on the topmost sheet of your business paper and consists of a company name, address, and business logo. Adjust the size and position of your logo. The purpose of a business letterhead is to inform and convey a message to the recipient.