CAN-SPAM Email Signature Compliance

The CAN-SPAM Act of 2003 governs U.S. commercial email and imposes several requirements that touch the email signature. Required elements in commercial messages include: accurate sender identification (no false or misleading header information, no deceptive subject lines), a clear indication that the message is an advertisement when applicable, the sender's valid physical postal address, and a working unsubscribe mechanism honored within 10 business days. For commercial email sent from an organization, the physical postal address is typically included in the email signature or footer. The CAN-SPAM rules apply to email whose primary purpose is commercial; transactional or relationship messages have different rules. Violations carry penalties of up to $50,120 per email under current FTC guidelines. Most U.S. organizations include a postal address in their signature footer specifically to maintain CAN-SPAM compliance across their commercial communications. Signature management platforms enforce the address requirement organization-wide so individual employees cannot accidentally send commercial email without the required disclosure.