Five post-purchase emails that lifted LTV by 22%

We moved the review request from day 7 to day 3 after delivery for consumables and day 12 for durables. Review rate rose 40% with no change in sentiment.

Replenishment nudges keyed to actual usage rate rather than a fixed 30 days produced the bulk of the LTV lift.

The cross-sell email performed worst when it ran second. Moving it to position four, after the education email, doubled its revenue per send.