To write a short notice resignation letter, include your position and effective date, explain your reason and express gratitude. Here are some tips for writing a professional resignation acceptance letter: Keep the letter short.Keep your letter brief and to the point. You should write a short notice if you are leaving in two weeks or less. Yes, an employer can terminate your employment when you hand in your resignation. They do not have to let your work out your notice period. Print out a copy of your resignation letter. Please accept this letter as a notice of my resignation. I am writing to acknowledge receipt of your resignation letter dated September 12, 2051. We appreciate the notice period you have provided and the time you have dedicated to the company.