Open question: Well writes is a straight notice letter called well?

I decided, mean present job to finish, because I do not like straight the way, which I am treated there. , If it is to be sent good, into a notice letter straight, instead of, inside boss is to be gone and meant explaining my question, whom I leave? I have too many things to continue at this moment to go inside there and inform mean boss my decision. Can I send a notice letter so straight? Owing to.