CASL does not require your business to obtain consent to send emails when it is otherwise implied. For example, if another business owner gives you their business card, which features the company’s email address, then you can send emails as long as they pertain to the business’s line of work.
The same is true for businesses that conspicuously publish their email addresses. If you run a search engine marketing company, and you pass a plumbing van on the highway with the company email address emblazoned on the side, this counts as implied consent, and you can send emails to the plumbing company offering your services. Similarly, a company that features its email address prominently on its website or in a trade magazine gives its implied consent to receive marketing emails.
The implied consent exemption also protects you when sending emails to those with whom you maintain business relationships. An individual or business that has purchased from your company in the past has given its implied consent. Even something as simple as making an inquiry about your products or services or filling out an application or contract to do business qualifies as implied consent.
Non-business relationships fall under the implied consent umbrella, too. If someone has been a part of your organization or has volunteered their time or money, for example, your company can send them marketing emails under the implied consent provision of CASL. The same is true for family and friends of executives in your company.