The email footer is legally required to include: sender's physical mailing address (CAN-SPAM), unsubscribe link that works within 10 business days, and optionally: copyright notice, social links, privacy policy link, and brand signature. GDPR also requires sender identity and contact information. A well-designed footer builds trust and reduces spam complaints by making unsubscribing easy. MisarMail auto-populates required legal footer elements for every campaign.