How To Write A Letter To Appreciate Your Boss . It is usually best to use a simple salutation such as dear mr./mrs./ms. Here are some tips which you can follow while writing such a letter: LETTER OF APPRECIATION TO YOUR BOSS Sample & Templates from www.sampleletter1.com Below are some listed points that are important to consider for the format of a letter of appreciation to the boss. You should avoid using trashy tones and you must use the tone and words that will express appreciation towards your boss. You must write the appreciation letter to the boss in the correct tone.