That's a legal requirement: https://www.ftc.gov/tips-advice/business-center/guidance/can-spam-act-compliance-guide-business https://www.ftc.gov/tips-advice/busi

That's a legal requirement: https://www.ftc.gov/tips-advice/business-center/guidance/can-spam-act-compliance-guide-business https://www.ftc.gov/tips-advice/business-center/guidance/can...