When should I send a post-purchase email?

Most post-purchase sequences are built on days since the order, which works only if every parcel takes the same time. They do not, so the messages drift out of place. A getting started message that arrives before the box does is worse than not sending one.

Where your tools allow it, trigger from the delivery event rather than the order. Fulfilment data usually carries a delivered status, and using it puts every message in the right place regardless of whether the parcel took two days or ten.

Where that is not available, use the realistic delivery window rather than the optimistic one, and add a buffer. Sending the first use message a couple of days after the latest expected arrival is safer than sending it on the earliest.

Before delivery, the messages are logistical and should be exactly that. Order confirmation with a real delivery date, dispatch with tracking, and a heads up if something changes. These are the most opened messages you will ever send, and the temptation is to fill them with promotions. Resist most of it. A single relevant line is fine. A full campaign inside a confirmation makes people less likely to trust the next one.

The rule underneath all of this is simple. Send when the customer has a question, and send the answer to that question.

Two moments carry almost all of the value in a post-purchase sequence.

The first is arrival. A day or two after delivery, send the message that helps them get it right. How to set it up, how to fit it, what to do first, what people commonly get wrong, how to care for it. For products with any learning curve, this message decides whether the purchase feels good or awkward, and that feeling decides whether there is a second order.

Make it useful rather than promotional. A short guide, a video, three tips. No offer, no upsell. This is the message that earns the right to sell later.

The second moment is once the product has been used properly, which depends entirely on what you sell. A kitchen item is used the same week. A garden product might not be used for a month. Seasonal clothing may sit until the weather turns.

At that point, ask how it went. Keep the reply easy and make sure a person reads the responses, because this is the cheapest customer research available and it tells you exactly why people do or do not come back.

Only after those two messages does anything commercial belong in the sequence.

Ask for a review after the customer has formed an opinion, which is the same moment as the check in or shortly after it. Asking on the day of delivery produces reviews about the packaging, which help nobody.

Make the ask small. A rating in one tap, with the written part optional and prompted by a specific question. What did you buy it for, how did it fit, what surprised you. Prompted reviews are more useful to other shoppers and to your own product pages.

The next order is a separate decision with its own timing, and it is set by your product rather than by a calendar.

For consumables, wait until slightly before the product runs out, using the interval from your own repeat order data. Arriving a week early is a service. Arriving a month late means they already bought elsewhere.

For durable goods, there is no reorder, so the next message introduces what naturally follows: the accessory, the companion item, the consumable that goes with it, the next size for a growing child.

For gifts, be careful. The buyer may never use the product, and a sequence about first use will read strangely. If you can identify gift orders, send them a different path.

And keep the commercial message separate from the service ones. Mixing them dilutes both.

Real orders break tidy sequences, and how you handle that is the difference between a programme that helps and one that irritates.

Delays. If a parcel is late, the sequence should pause and a service message should go out before the customer notices. Nothing damages a relationship faster than a cheerful how are you enjoying it message about a parcel that never arrived.

Multi item orders with different delivery dates. Anchor to the last item where possible, or send the first use content per item as each arrives. Referring to the order as one thing when it arrived in three parcels reads as carelessness.

Seasonal and weather dependent products. A customer who buys a winter item in a summer sale will not use it for months. Delay the usage content to the season, or make it about storage and preparation instead.

Returns and cancellations. The moment a return is started, the customer should leave the sequence and enter a different one. Asking for a review from someone in the middle of returning the item is a complaint waiting to happen.

Subscriptions. The first delivery deserves the full sequence. Later ones need much less, and repeating the same welcome content every month is a common and avoidable cause of cancellations.