An effective resignation letter includes your name, your job title and your departure date. 4100 Normal Street, San Diego, CA 92103.The letter can be 2-3 sentences. Just say you are resigning with the effective date. I am providing two weeks' notice. My last date of employment is (month, day, year). Teacher: should I write a resignation letter my principal asked me instead of letting my contract not renew? The following is a sample of a simple resignation. Will your resignation be a surprise to your administration or did they know you were looking? It's ideal to write a resignation letter as soon as you know you will be leaving.