Canadian Anti-Spam Law CASL on Magento newsletter, what's the strictest compliance setup?

CASL (Canada's Anti-Spam Legislation, in force since 2014) is the strictest anti-spam regime in the world, stricter than GDPR or CAN-SPAM. Key requirements for Magento newsletter + email marketing: (1) Express consent, double-opt-in is effectively required; implied consent is narrow and time-limited (24 months for past customers, 6 months for inquiries); (2) Clear sender identification, physical mailing address must appear in every CEM (commercial electronic message); (3) Unsubscribe must be functional within 10 business days and free; (4) Penalties up to C$10 million per violation for organisations. Magento out-of-the-box subscribe is not CASL-compliant, we replace it with a double-opt-in flow, consent-evidence log (IP + timestamp + form-URL stored 3+ years), CASL-compliant footer block applied to every transactional + marketing email, and integration with Mailchimp / Klaviyo / SendGrid CASL-compliant lists. Plus a quarterly CASL-evidence export for audit.