The following are the things to keep in mind when writing an immediate resignation letter: Write the date first. Explain only necessities.Due to unforeseen personal reasons, I am unable to provide any notice. In the opening paragraph, clearly state that you are resigning from your position. We've rounded up tips and examples for writing a resignation letter that'll help you maintain work relationships long after leaving a company. However, in other situations, employers can regard notice of resignation effective from the date they receive the letter. Do not hesitate to call me at 123-123-1234. Sincerely, Danielle Barren.