Ask most store owners about email and they think of campaigns - the newsletter, the sale, the product drop. Those matter. But the steady, compounding part of email revenue usually comes from flows: automated messages that fire when someone does something, whether you are at your desk or asleep. Set them up once, design them well, and they keep earning.
The trap is treating flows as a checkbox - switch on the default templates and move on. The default welcome email is grey, the cart reminder looks nothing like your site, and nobody measures what they earn. Done properly, these are some of the best-performing emails you will ever send. Here is the set worth building, roughly in priority order.
Start with the ones that recover money
1. Welcome
The welcome flow greets new subscribers while their interest is highest. It should introduce the brand, set expectations, deliver any sign-up offer, and gently point to your best products. A short series - two to four emails - almost always beats a single message.
2. Abandoned checkout
Someone reached checkout and stopped. This is the highest-intent moment in the whole journey, and a timely, well-designed reminder recovers a meaningful share of those orders. Lead with the product they left, keep it short, and make it effortless to return.
3. Browse abandonment
A softer signal than cart: someone looked at a product but never added it. A light nudge - "still thinking it over?" - with the item and a couple of alternatives picks up intent the cart flow never sees.
Then the ones that build loyalty
4. Post-purchase
The window right after an order is when trust is highest and most brands go silent. A post-purchase flow confirms the order, sets expectations, and - once the product has landed - asks for a review or suggests what pairs well with it. This is where a first order quietly becomes a second.
5. Replenishment
If you sell anything that runs out - skincare, coffee, supplements, refills - a replenishment flow timed to when they are likely low is one of the highest-return emails you can send, because it arrives exactly when it is useful.
6. Win-back
Customers go quiet. A win-back flow reaches people who have not bought or engaged in a while, reminds them why they liked you, and - only if it makes sense - offers a reason to return. It also tells you who to stop emailing, which protects your deliverability.
How to prioritise
You do not need all six on day one. Build in the order above: the flows that recover money you have nearly earned (welcome, checkout, browse) before the ones that compound over time (post-purchase, replenishment, win-back). Get each one live, measured, and earning before adding the next.
Design and measure them like campaigns
The single biggest upgrade most stores can make is simply to design their flows - build them from the same system as your campaigns so they look unmistakably like your brand, not like an ESP default. Then measure them on revenue per recipient and the repeat rate they drive, not open rate. A flow is a product: ship it, watch the number, and improve the timing, creative and offer until it earns more.