How to write a resignation letter that's effective immediately? Dear Ms. Emily Clarke,.Learn how to write a letter of resignation to quit your job on good terms. I am writing to inform you that I will be resigning from my position as (Title) at (Company Name). "A resignation letter should be short and to the point. Simply explain why you're leaving and the date of your departure. Learn how to write a letter of resignation to quit your job on good terms. Due to unforeseen circumstances, I must resign from my position effective immediately. Please be advised that I am resigning my position with immediate effect. Regards,. Note your last working day. 5.