Canada's Anti-Spam Legislation (CASL), effective July 1, 2014, mandates that commercial electronic messages (CEMs) can only be sent with the recipient's express consent and must meet specific form and content requirements. It applies to all businesses sending CEMs to or from Canada, imposing significant penalties for non-compliance and creating a private right of action for affected individuals. Exemptions exist for certain types of messages, and U.S. businesses operating in Canada must ensure compliance with CASL to avoid liability.