Canada's anti-spam legislation (CASL) has been in effect for over three years, but if you haven't addressed any of the required changes, you'd better get to work. The grace period for implied consent ended almost a week ago and companies can be held liable for non-compliance.
According to the CASL website, this legislation is designed "to help protect consumers and businesses alike by deterring the most damaging and deceptive forms of spam from occurring in Canada, creating a more secure online environment." The law requires that companies gain a consumer's consent in order to send them email. This law applies to all companies doing business in Canada regardless of origin.