Celebrates an achievement, anniversary, or usage milestone. Real examples, captured from actual signups.
Milestone emails celebrate something the customer achieved: an anniversary, a usage number or a goal reached. They build goodwill and remind people of the value they get.
"You sent 10,000 emails this year" lands harder than generic congratulations.
Badges and year-in-review cards invite customers to post about you.
Close with what they can achieve next, and the feature or plan that helps.
