How to write a resignation letter that's effective immediately? Commence your letter with a formal salutation and a concise introductory paragraph.Dear Sirs: Effective immediately, I am not a member of UFCW Local 99. Leaving a job isn't easy. Learn how to write an immediate resignation letter with our comprehensive guide, including tips, examples, and a customizable template. Please accept this letter as a notice of my resignation. Please be advised that I am resigning from my role of Product Manager with Bradley Org. My final day in the office will be August 31, 2023. (For example, "I regret to inform you that I will be resigning from my position, effective immediately. Effective immediately, please be informed of my resignation.