Glossary Terms

CASL (Canada’s Anti-Spam Legislation)

CASL, Canada's Anti-Spam Legislation, is one of the strictest commercial-email laws in the world, and it applies to any marketing message sent to someone in Canada. Where the US CAN-SPAM Act lets you email first and offer an opt-out, CASL requires consent before you send: you need express or implied permission on file first. Every message must also identify the sender with a real physical address and include a working one-click unsubscribe. The penalties are serious, reaching up to $10 million for a company, which is why most Canadian senders build their lists on confirmed opt-in and keep proof of consent.