There are different types of emails, such as transactional emails (for things like account notifications and password resets) and marketing or campaign emails (like newsletters and promotions). Most providers don’t allow sending marketing emails by default you typically need to pay for a dedicated service for that. If you’ve signed up for a transactional email-only plan, you won’t be able to send other types of emails. This depends on the provider’s policy.

Make sure to check with your provider policy and plan before sending marketing emails, otherwise your account might get blocked.