An Article providing an overview of Canada's Anti-Spam Legislation (CASL) and key compliance obligations. This Article discusses CASL's prohibition on sending commercial electronic messages (CEMs), such as emails or text messages, without express opt-in consent of the recipient, form requirements, key CASL exemptions, and regulatory enforcement. In addition, this Article addresses CASL's application in the context of cross-border transactions and commercial agreements and provides a comparison to US law.