Resignation acceptance letter template. Enter the resignation and effective date on appropriate employment records.Does the employer have a right to tell you to leave earlier than what your resignation date, as you've already stated that you will be quitting? Yes. Illinois is an "employment at-will" state, meaning that an employer or employee may terminate the relationship at any time, without any reason or cause. Acknowledge the resignation in an email, letter, or other writing in order to formally and unambiguously identify the last day of work. This Easy Form does not deliver your resignation letter to your principal. This process is for voluntary departures only, such as resignations, retirements, etc. However, no teacher may resign during the school term, without the concurrence of the board, in order to accept another teaching assignment.