Several key restrictions apply to email marketing, including:
1. Consent: Marketers must obtain explicit consent from recipients before sending emails. This is often achieved through opt-in forms where users voluntarily provide their email addresses.
2. Unsubscribe Mechanism: Every marketing email must include a clear and easy way for recipients to unsubscribe from future emails. This is a requirement under laws like the CAN-SPAM Act and GDPR.
3. Content Regulations: The content of the email must not be misleading. Subject lines and sender information should accurately represent the content of the email.
4. Data Protection: Marketers must comply with data protection laws such as GDPR, which require the secure handling and storage of user data.