There are several important regulations that email marketers need to be aware of. The General Data Protection Regulation (GDPR) in the European Union is one of the most stringent. It requires companies to obtain explicit consent from individuals before sending them marketing emails. In the United States, the CAN-SPAM Act sets the rules for commercial email and gives recipients the right to stop emails from being sent to them. Additionally, the California Consumer Privacy Act (CCPA) provides specific protections for California residents.