Creator newsletters will move in two separate directions. A majority will be pulled toward programmatic advertising, while a few move toward upmarket endorsements.

Top newsletter authors have taken an "old school" email marketing tactic and applied it to email newsletter growth.

Run the Paid, Ad-free Email Newsletter Playbook to keep subscribers happy while you generate income.

Newsletter advertisements that appear when a subscriber first opens the message in Gmail or Apple Mail is more than twice as valuable as other placements.