I have resigned on _____ date because ______(reasons). Learn how to write a resignation letter (and what not to include) and then use our example letters as a guide.Can anybody give me format of Resignation letter and Experince certificate? The letter should be written to the human resources department or your senior to issue an experience certificate on your behalf. You've found a new job, but now you have to let your current employer know. Here are some examples of a good resignation letter to get you started. You've found a new job, but now you have to let your current employer know. Here are some examples of a good resignation letter to get you started. They should be written in a respectful and professional tone, and be submitted directly to the employee's supervisor or manager. Explore rewarding career opportunities with The School District of Philadelphia.