1. Identity of the Sender: The email must clearly identify the person or business sending the email. This includes providing a valid physical postal address. 2. Opt-Out Mechanism: Recipients must be given a clear and easy way to opt-out of receiving future emails. This opt-out request should be honored promptly. 3. Purpose of the Email: If the email is an advertisement, this must be clearly disclosed. 4. Privacy Policy: Information about how the recipient's data will be used, stored, and protected should be provided, often through a link to the company's privacy policy.