Maintaining a permission-based list requires ongoing efforts:
Regular Cleaning: Remove inactive subscribers and invalid email addresses to keep the list healthy. Re-Engagement Campaigns: Send re-engagement emails to inactive users to renew their interest or confirm their desire to remain on the list. Updated Preferences: Allow subscribers to update their preferences and frequency of communication to ensure they receive relevant content. Unsubscribe Option: Always include an easy-to-find unsubscribe link in your emails to comply with legal requirements and respect the recipient's choice.