The case discussed is the latest in a series of enforcement related activity under CASL - see e.g. New CASL Ruling: CRTC Provides Guidance on B2B Messaging and the Due Diligence Defence - and serves as an important reminder that CASL applies to all commercial electronic messages, which clearly includes email, but also text messages.
If you do, you should make sure you understand the privacy and personal information implications. CTV reports that some Canadian retailers are now offering their customers an "e-receipt", which they can receive by email or access at dedicated websites. Sure, it's a "green" option, and maybe more convenient for customers who want to track their purchases, but it requires the customer to provide an email address, which might allow retailers to "learn a lot about a customer's preferences and buying habits".
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