Follow the steps below to craft an effective signon letter and gather lots of signatures to help sway decisionmakers. In this article, we explain what an official letter is and how to write one, plus we provide a template and example of an official letter for you to reference.The signature above your printed name signifies that you are personally affirming or validating the content of the letter. How to correctly format a business letter. Includes detailed instructions and example on how to write a business letter for any situation. A business letter is a formal letter. Unlike a résumé or cover letter, it can be more than one page, and is likely to contain six parts. Write the decedent's full name, including aliases, and estate's index (file) number. Index. (WRITER'S SIGNATURE BLOCK Your full name four lines below the closing. For an example, see the end of this sheet for a sample letter.