A post-purchase email is any email sent to a customer after they buy, from the order confirmation through to a review request, care guide or suggestion for what to buy next. Most businesses send them as an automated sequence, often called a post-purchase flow.
How post-purchase emails work
A completed order in your shop or booking system triggers the sequence through your platform’s email automation. A typical flow for an online shop runs something like this:
- Order confirmation, straight away: what was bought, the price, delivery details and how to get help.
- Dispatch and delivery updates, as the order moves.
- Getting started, a few days after delivery: how to use, care for or get the most from the product.
- Review or feedback request, once the customer has had time to use it.
- Next purchase, timed to the product: a refill when the first one should be running low, or an accessory that suits what they bought.
Service businesses follow the same pattern with different content: a booking confirmation, what to bring, aftercare advice and a reminder when the next appointment is due.
Why it matters
The weeks after a sale decide whether a customer buys again. Clear updates cut “where is my order?” enquiries, practical set-up advice reduces returns, and a well-timed second suggestion turns a one-off buyer into a repeat customer, which raises customer lifetime value. Because these emails reach people who have just chosen you, they are usually read more closely than a general newsletter.
In the UK, a post-purchase flow normally mixes two kinds of message, and the law treats them differently. Order confirmations and delivery updates are service messages, a type of transactional email, so they do not need marketing consent. Cross-sell and replenishment emails are marketing. You can send those under the soft opt-in if you collected the customer’s details during the sale, gave a clear chance to refuse marketing at that point, and keep offering an opt-out; otherwise you need consent. Stuffing promotions into an order confirmation can turn that into marketing too.
Review requests need care as well. The Digital Markets, Competition and Consumers Act 2024 brought in rules against fake reviews and against concealing negative ones, so the safer approach is to ask every customer in the same way rather than filtering who gets asked (review gating).
Common mistakes
- Packing discount codes into the order confirmation, so a service message becomes marketing sent to people who opted out.
- Asking for a review before the item has even arrived.
- Sending the same cross-sell to everyone, including people who bought the recommended item last month.
- Replenishment reminders with no link to how long the product actually lasts.
- No exclusion for cancelled or refunded orders, so the customer still receives “how are you enjoying it?”
How to act on it
List every email a customer currently receives after buying, including the ones your shop platform sends by default, and mark each one as service or marketing. Make sure the marketing ones only go to people with consent or a valid soft opt-in, and that each includes a working unsubscribe link.
Then fill the gaps. If returns or “how do I” questions are common, add a getting-started email. Time review requests to when the product has been used, and base follow-up suggestions on what each customer actually bought. Planning flows like this, with the tracking to see what each one earns, is part of my digital marketing strategy and consulting work.