CAN-SPAM allows you to purchase a mailing list and send to the people on that list, so long as you provide them with an unsubscribe mechanism. On the other hand, CASL requires that you be able to prove that the people you’re sending emails took a specific action that gave you permission to contact them.
CASL further differentiates between two types of permission: Express consent and Implied consent.
You can also print out the examples, and keep them handy:
Still have questions about the new Canadian Anti-Spam legislation?
Disclaimer: This information is to help you better understand the requirements for compliance to CASL, the Canadian anti-spam legislation that came into full force on July 1st, 2014. It is not legal advice, nor should it be used instead of said legal advice.