Need help with your official Resignation Letter? When you send a resignation letter to your employer, it’s a good idea to add a word of thanks. You always want to leave a job on the best possible terms. A heartfelt resignation letter helps you to ensure your last impression is as good as your first one. To help you out, we have collected several formal and well-written Resignation Letter Formats. These sample resignation letters include sincere appreciations for the opportunities provided by your boss, manager or project lead.