Learn how to write a response to a resignation letter and use our examples and template to help you write your own. Here is what a heartfelt resignation letter should include with a sample, as well as an example letter noting regret at leaving.Go in person to see your former boss and say you regret quitting. Ask if you've been replaced. Resignation Acceptance Email templates: Discover how to write an effective resignation acceptance letter. Learn how to write a professional resignation acceptance letter with our helpful guide. In the first sentence of your letter, clearly and concisely state your intention to resign and your final working day. I sincerely regret my decision to resign from Company A, but I believe I must leave for my own personal growth as an employee. When you write a letter of resignation, you have quit. More than a quarter of people who recently quit their job regret the decision.