CASL
CASL, or the Canadian Anti-Spam Legislation, Canada's attempt to protect both consumers and business from "the misuse of digital technology, including spam and other electronic threats".
CASL is Canada's anti-spam law governing consent, identification, and unsubscribe requirements for commercial messages.
Definition and examples
The Canadian Anti-Spam Legislation (CASL) is Canada's comprehensive federal law that came into effect on July 1, 2014, designed to protect consumers and businesses from spam, identity theft, phishing, spyware, and other electronic threats. CASL establishes strict rules for sending Commercial Electronic Messages (CEMs), installing computer programs, and collecting personal information electronically, making it one of the world's most stringent anti-spam regulations. Unlike the United States' CAN-SPAM Act, which operates on an opt-out basis, CASL requires explicit opt-in consent before sending commercial messages. This fundamental difference makes CASL significantly more restrictive and places the burden of proof on senders to demonstrate they have proper consent to contact recipients.
Why it matters
It matters because subscriber trust and long-term deliverability depend on it. When people understand what they are agreeing to and can control the relationship easily, complaints go down and the list stays healthier.
Common mistakes
A common mistake is treating this as a legal checkbox instead of a subscriber experience choice. If people cannot understand it or use it quickly, complaints rise and trust drops.
Related terms
Key takeaways
CASL is one of the world's strictest anti-spam laws, requiring explicit consent before sending commercial messages to Canadian recipients
Penalties can reach $1 million for individuals and $10 million for businesses, making compliance essential for organizations of all sizes
Express consent is preferred and lasts until withdrawn, while implied consent has strict limitations and expiration timelines