You probably won't have to, but some companies do require a formal letter, so you'll have to check with HR as to whether you need to write one. Here are 6 simple steps in writing a resignation letter to a job that you hate: 1.Keep it short and sweet. Briefly provide context for why you're resigning. Refrain from going into too many details that may create a negative tone. I signed my resignation letter under duress. You mean I should discuss this with my old Job HR? The purpose of this message is to inform you that I am resigning my position at EvilCorp. I signed my resignation letter under duress. You mean I should discuss this with my old Job HR?