CASL requires that all commercial email messages sent to or from Canada receive consent from recipients before sending messages. Such consent can be implied. If the sender has a preexisting relationship with the recipient, for instance, the communication is viewed as consensual. Australia’s Anti-Spam Act has similar stipulations and applies to emails to and from that country.
The GDPR has similar restrictions about email messages as well, but the law affects many more people — 750 million versus about 60 million for the combined populations of Canada and Australia. Neither soft opt-in or soft opt-out options are allowed. These restrictions are much more stringent that those set forth by the U.S.’s 2003 CAN-SPAM Act, which does not require that emailers permission before they send their emails.
If you’re marketing into the EU, you MUST get into gear to become GDPR compliant. This is NOT something you can leave for the last moment, week or even month.