Double Opt-In: This process verifies that the email recipient has explicitly agreed to receive marketing emails. Unsubscribe Link: Always include a clear and easy way for recipients to opt-out of your emails. Reputable Email Service Providers: Use trusted providers to ensure better deliverability and adherence to anti-spam laws. Email Authentication: Implement SPF, DKIM, and DMARC to verify your email's legitimacy. Segmentation: Send targeted emails to segmented lists based on user behavior, interests, and demographics.