Not just single emails: see every step a brand sends, in order, with the day each one arrived after signup.
Onboarding sequences start at signup and walk new users to their first win: a welcome, then a few emails that each unlock one step. The typical one here has 3 emails over 6 days.
Post-purchase sequences follow an order: thanks, delivery, how to get the most from the product, then a review ask or the next purchase. The typical one here has 3 emails over 8 days.