Sure. There are the right ways to do third party communications and there are the wrong ways to do third party communications. CASL actually allows for both, unfortunately.
The right way that typical people will look at doing third party communications in regard to even the idea of list rental is similar to the idea of taking out a full-page ad in a newspaper. I will give you my advertisement, you will send it to your communication list because you have the proper consents and can manage the unsubscribes. I don't see any of the addresses until people choose to either take my offer or engage and give me some type of consent directly. That's the right way to do third party communications.
The other way really comes down to the idea of, “I have a list. Here you go. Please feel free to send it based on our contractual agreement.” That industry, right after CASL came into force, was studied by an organization in Toronto. They said the available number of lists to be used that way in Canada went from 400 to 14 because none of them had proper consent prior to CASL. When they were reviewed against CASL, that industry basically disappeared, actually probably accounting for a significant amount of unsolicited email communication also disappearing.