A post-purchase flow is an automated sequence of emails (and sometimes SMS) sent to customers after they complete their first order. It is the most underleveraged automation in e-commerce - while brands invest heavily in acquiring customers and recovering abandoned carts, the window immediately after a first purchase is often left empty, despite being the moment when a customer's affinity for a brand is highest and their receptivity to further engagement is at its peak.
The post-purchase flow serves several distinct commercial goals across its sequence. Relationship building: the first email (sent immediately or within hours of purchase) sets the tone for the customer relationship - it confirms the order, expresses genuine appreciation, and begins communicating the brand's values and story in a way that goes beyond a transactional receipt. Expectation setting: subsequent emails manage the pre-delivery experience - shipping updates, what to expect when the product arrives, how to use it correctly. Brands that do this well dramatically reduce support tickets and reduce the cognitive dissonance that can lead to returns. UGC and review generation: a well-timed review request email (sent 7-14 days after estimated delivery) captures feedback when the customer's experience is fresh, generating the social proof that improves conversion for every future visitor. Second purchase conversion: the final emails introduce complementary products, surface bestsellers the customer has not tried, or present a subscription or replenishment offer - turning a first-time buyer into a repeat customer at a fraction of the cost of re-acquisition.
For Shopify brands using Klaviyo, the post-purchase flow is typically triggered by the Placed Order event and branches based on whether the customer is a first-time or returning buyer, the specific product category purchased, and the customer's predicted lifetime value. First-time buyers receive the full relationship-building sequence; returning customers receive a shorter, more direct sequence focused on the next purchase. Building these branches requires clean product data and thoughtful segmentation logic, but the incremental revenue from a well-segmented post-purchase flow consistently justifies the setup investment. The post-purchase flow is the primary driver of repeat purchase rate improvement - brands that invest in it systematically outperform those relying on broadcast campaigns alone to drive second purchases.
The mistake that costs the most here is timing off the wrong event. Most of this sequence should be anchored to delivery rather than to purchase - a review request that arrives while the box is still in transit reads as careless and trains people to ignore the sender. Feed the flow a fulfillment or delivery event and the whole sequence lands correctly. Built that way, email and SMS automation stops being a receipt and starts doing real customer retention and loyalty work.
Getting the review-request email right is worth treating as its own project, since timing is the detail most brands get wrong by anchoring to purchase date instead of delivery date. This guide to Shopify review request emails covers the timing and wording that actually gets customers to leave one.
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