CASL (Canada’s anti-spam law)

Canada’s anti-spam law: consent before sending commercial email or texts, sender identification, and an unsubscribe honored within 10 business days.

In force since July 1, 2014, CASL is an opt-in law, the opposite of the US CAN-SPAM, which lets you email until someone opts out. Consent can be express or implied, for example by an existing business relationship such as a purchase, but implied consent expires after a set period. Every message must identify the sender and include a working unsubscribe. Administrative penalties for businesses can reach millions of dollars per violation.

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Related terms

CAN-SPAM Act: The US law for commercial email: honest headers and subjects, a postal address, a working opt-out and honoring it within 10 business days.
PKE marketing consent (Polish Electronic Communications Law): Since November 10, 2024, Polish law requires prior consent for marketing by email, phone or text, to companies too; asking for it by phone already counts.
One-click unsubscribe (RFC 8058): A standard way for mail apps to unsubscribe a reader with one POST request, required by Gmail for bulk senders since 2024 and recommended by Yahoo.
Suppression list: Addresses you must never email again: unsubscribes, hard bounces and spam complaints, checked before every send.

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