The CAN-SPAM Act is a U.S. law established in 2003 to regulate commercial email messages. Its primary goal is to protect consumers from unwanted and deceptive emails, ensuring that they have the right to opt out of future communications. The law requires senders to include clear identification of the email as an advertisement and provide a valid physical address. Under the CAN-SPAM Act, businesses must also honor opt-out requests promptly and cannot use misleading subject lines. Violations of the law can result in significant fines, making it essential for marketers to comply with its requirements when sending promotional emails.