Learn how to write a short notice resignation letter with this stepbystep guide, template and examples of formal resignation. Give the reason for resignation.If you are handing a regular notice, including the reason for quitting or not is totally up to you. A resignation letter should be brief. Resignation letters don't need to be very long in fact, short and to the point is often best. Resignation letters don't need to be very long in fact, short and to the point is often best. My last day of work in the office will be on (a date two weeks in the future). Your resignation email's subject line should say your name and that you're resigning. Dear Ms. Emily Clarke,. I'm writing to inform you of my intent to resign from my position as a staff nurse in the ICU at Johnson County Hospital.