How to write a resignation letter that's effective immediately? Please accept my sincerest apologies for being unable to provide you and the Davidson Team with a notification that includes a minimum two-week notice.Start with the facts and be direct. This template provides more detailed information. Explore why a good resignation letter is important and how to write it, and check out our free resignation letter examples. Explore why a good resignation letter is important and how to write it, and check out our free resignation letter examples. Use this resignation letter example to inform your employer that you need to resign immediately and will not be able to give two weeks' notice. In the next paragraph, briefly express how thankful you are for the opportunities and experiences you've gained throughout your tenure with the company. My resignation is effective immediately. I wish you both great success going forward.