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.In the case of accepting a resignation, for example, the board is free to insert "with regret" in the actual motion, after the word accepts. How to Write this Acceptance Letter: Expert Tips and Guidelines. Always accept a resignation with dignity and a positive tone, no matter what the circumstances. I regretfully have to inform you that, after much thought, I have decided to resign and please accept this letter as a formal notice of my resignation.