If most customers buy once and disappear, look at what they get from you after the order confirmation. If it's nothing until the next sale newsletter, a customer who bought a coffee grinder gets the same 20%-off blast as someone who has never ordered. Nothing in their inbox connects to what they bought, so nothing reminds them to come back.
The fix is a short series of emails that starts after the first order and follows what happens to the product: it arrives, they use it, it runs out or needs something else. The timing comes from your products, not from a template, so the first job is working out that timing.
Work out the timing for each product
Generic advice gives you fixed days ("send on day 3, day 14, day 30"). Those numbers only fit some products. A bag of coffee and a winter coat don't have the same next step at the same time.
For each product, or each group of similar products, fill in this table:
| Question | What you write down |
|---|---|
| When does it usually arrive? | Your normal delivery time |
| When will they first use it? | Same day, after setup, when the season starts... |
| When can they tell if it works? | First use, after a week of use, after the first wash... |
| Does it run out or wear out? | Yes (consumable) / No (one-off) |
| If it runs out, when? | Size of the pack ÷ how much a typical customer uses |
| What do they need next? | Refill, accessory, the next size up, a matching item |
Then sort the product into one of three groups:
- Runs out (coffee, skincare, pet food, printer ink). The second order is the same product again. Time the main email just before it runs out.
- Needs something else (a grinder, a camera, a sewing machine). The second order is a related item. Time the email for when they've used it enough to want more from it.
- Bought rarely (a mattress, a wedding gift, furniture). A quick second order is unlikely. Send the help email, then let them join your regular newsletter instead of pushing a reorder.
If you have a year or more of orders, check your guess against real data. Export orders, find customers with at least two orders, and look at the days between their first and second. The middle value of that list is a better starting point than any estimate.
The three emails
Email 1: help them use it. Send it around the time they'll first use the product. How to get started, one common mistake to avoid, how to get help. No discount, no product grid. The point is that the customer gets value from what they already bought; someone who can't get it working has little reason to buy again.
Email 2: the next useful thing. Send it when they can tell whether the product works. For "needs something else" products, this is where the related item goes: the filters for the coffee machine, the case for the camera. Show one to three items that go with what they bought, not your bestsellers.
Email 3: the reminder. For "runs out" products, send it a little before the date in your table, with a direct link to reorder the same item. For "needs something else" products, it can be a second related item or a simple "how's it going?" with a link to your range.
Add an exit rule to all three: if the customer places another order, they leave the series. Otherwise someone who already reordered gets a reminder to reorder.
A worked example (made-up numbers)
Say you sell loose-leaf tea in 100 g bags, and you estimate a customer brews about 3 g a day. 100 ÷ 3 is roughly 33 days per bag. Delivery takes 3 days.
- Email 1, day 4: how to brew it, water temperature, how long to steep.
- Email 2, day 14: a teapot or infuser that suits that tea, and one other blend similar to what they bought.
- Email 3, day 30: "Running low?" with a one-click link to the same bag.
Every number here is invented for the example. Use your own pack size, your own delivery time, and the reorder gap from your own orders once you have it.
Split by what they bought
One series for the whole store sends tea brewing tips to someone who bought a teapot. Build a version per product group instead. You don't need one per product; start with a few groups, matching the "runs out / needs something else / bought rarely" sort above.
Start with your best-selling group and get one series working before you build the next.
One thing to check before you switch anything on: some post-purchase automations can send to customers who bought but never subscribed to marketing. Whether you may send them marketing emails depends on the law where you and your customers are, so check what applies to you before you include them.
One number to watch
Ignore open rates for this. The number that tells you whether the series works is:
Share of first-time buyers who place a second order within your reorder window.
Take customers whose first order fell in a given month. Count how many ordered again within the window from your table (for the tea example, around 40 days). Divide by the total. Do it before you turn the series on and again two or three months later, for the same window.
If the number doesn't move, look at email 2 first. If the related items are things nobody needs, the series is just a reminder. If the number does move but most second orders come after a discount code, try one version of email 3 without the discount and compare.
Setting it up in an email platform
The series is an automation triggered by a placed (or paid) order, with delays between the emails, a filter for which products it covers, and an exit when the customer orders again.
Omnisend has pre-built post-purchase workflows that match these pieces. Its Order Follow-up workflow starts on a paid order, lets you filter by product title and set delays, and has optional exit conditions and a frequency limit so a customer who orders twice in a short time doesn't go through it twice. Its Customer Reactivation workflow starts on a placed order, waits for a delay you set, and drops the customer out as soon as they order again; that one fits the "reminder" email for products that run out. Omnisend's help pages list both workflows as available on all plans.
The limitation that matters for email 2: Omnisend's product recommender block can fill an email with your bestsellers, newest or most viewed products on any plan, but recommendations based on what that customer bought or viewed need the Pro plan or an add-on to the Standard plan. Without them, you pick the related items by hand for each product group, which can work for a small catalogue.
If you're still sending everything by hand, set up the series for your first group before you look at tools. And if new subscribers aren't reaching a first order at all, start further up with a welcome sequence or abandoned cart emails.