How to write a resignation letter that's effective immediately? A short resignation letter is the way to go.Include your name, position, the date of resignation and the intended last day of work in the first paragraph. Here is our sample email to resign with immediate effect. Dear (Name), I am resigning from my role as (job) with immediate effect. A resignation letter is a way to formally end your employment and provide details such as an end date and contact information. When resigning without notice, your letter should state clearly that the resignation will be effective immediately. Dear Sirs: Effective immediately, I am not a member of UFCW Local 99. Please accept this letter as official notification of my resignation from my position as Floor Manager, effective immediately. I apologize for any inconvenience this may cause.