You want to give at least a two weeks' notice. The header at the top of the resignation letter (the same thing as a letterhead) should include your name, address, phone number and email.No. You can email your resignation to the boss. Leave a copy in a sealed envelope on bosses desk. My best advice is to reach out to your HR department and work towards a resolution. State the Position You're Resigning From With An Effective Date. The Supervisor or HR Partner is required to send a written acknowledgment to any employee who resigns. Then, state your intent to resign and exact date of departure. By writing a concise letter, you'll already be keeping things clear and professional. They are a formal notice that can be placed on file.