I need to prioritize my health, so I am resigning immediately. " Expression of gratitude.Mail Resignation Letter Template is a written notice of intention to leave a job. 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. Simply write that you are submitting your resignation effective xx date because you will be pursing other career opportunities. Learn how to write a short notice resignation letter with this stepbystep guide, template and examples of formal resignation. Use one of our resignation letter templates. I am resigning my position effective immediately.