Most stores obsess over campaigns when the essential ecommerce email flows, welcome, abandoned cart, and post-purchase, are the automations quietly generating the bulk of email revenue without anyone writing a new email that week.
Campaigns are the emails you write and send once, a sale announcement, a new arrival. Flows are automated sequences triggered by what a specific customer does, signing up, abandoning a cart, buying something, and they run in the background without you writing a fresh email each time. The reason flows tend to generate a disproportionate share of ecommerce email revenue is timing: they reach someone at the exact moment their intent is highest, right after they showed interest, not whenever your campaign calendar happened to schedule a send.
Roughly speaking, across most ecommerce accounts I've looked at, three flows, welcome, abandoned cart, and post-purchase, account for the large majority of automated email revenue, often 70 to 80 percent, even though they're a tiny fraction of the total emails sent in a given month.
Flows also compound in a way campaigns don't. A campaign's revenue mostly stops the day after you send it, but a flow keeps generating revenue every single day as new customers move through it, a welcome flow written once in an afternoon can still be converting new subscribers a year later without you touching it again, which is part of why getting these three right pays off so much longer than a typical campaign calendar does.
The welcome flow triggers the moment someone joins your list, usually through a discount popup or a lead magnet, and it's doing two jobs at once: converting that first-time interest into a purchase, and setting expectations for what your emails will be like going forward. A strong welcome flow is three to five emails over the first week or two, an introduction and the discount if you're offering one, a story about why the brand exists, social proof or bestsellers, and a gentle nudge if they still haven't bought.
This flow also has an outsized effect on deliverability, since it's the first impression Gmail's filters form about how subscribers interact with your domain. A welcome flow people actually open trains the algorithm that your mail is wanted. For the full breakdown, see a high-converting welcome email sequence.
Abandoned cart is the highest-converting flow in ecommerce, full stop, because it targets someone who added a product to their cart and then, for whatever reason, distraction, hesitation on price, a second thought, didn't finish. That's about as close to purchase intent as email marketing gets. A typical structure is three emails: a reminder an hour or so after abandonment, a follow-up the next day that might address a common objection or show reviews, and a final nudge a day or two later, sometimes with a small incentive if your margins support it.
The mistake I see most is sending only one abandoned cart email instead of a short sequence. Different people abandon for different reasons, and a single email only catches the ones who just got distracted, not the ones sitting on a real hesitation that the second or third email could actually address.
Worth noting that discounting in the abandoned cart flow isn't mandatory, and for higher-margin or premium brands it can train shoppers to always wait for a coupon before checking out. If your margins allow it, fine, but a strong second email addressing shipping cost, sizing, or return policy questions often recovers just as many sales without touching price at all.
Post-purchase is the most overlooked of the three because it doesn't feel urgent, the sale already happened. But this flow is where repeat purchase behavior, reviews, and referrals get built, and repeat customers are dramatically cheaper to sell to than new ones. A good post-purchase flow includes an order confirmation with genuine warmth rather than just a receipt, a shipping update, a check-in a week or two after delivery asking how it's going, and a review request timed once they've actually had a chance to use the product.
Further out, this flow is also where you introduce complementary products or a subscription option, since someone who just bought and is happy with it is far more receptive to a next offer than a cold subscriber ever will be.
All three flows depend on your platform actually tracking the trigger events correctly, cart abandonment in particular breaks silently if your tracking script isn't set up right, and you won't necessarily notice, the flow will just quietly underperform for months. Worth testing each flow yourself by triggering it as a customer would, at least once a quarter.
And none of these flows matter if they're landing in Spam or Promotions instead of Primary, since an abandoned cart email that arrives a day late in a Promotions tab has lost most of its urgency by the time someone finds it. If you're running these flows and revenue feels lower than it should, deliverability is worth ruling out before you rewrite the copy again.
Welcome, abandoned cart, and post-purchase. Together they typically generate the large majority of automated email revenue for most ecommerce stores, even though they're a small share of total email volume.
Abandoned cart, usually by a wide margin, since it targets people who already showed clear purchase intent by adding something to their cart.
Three to five for welcome, three for abandoned cart, and three to four for post-purchase tends to be a solid starting structure, though it's worth adjusting based on your average order value and purchase cycle.
I run Unbury, a done-for-you deliverability service, and one of the most common revenue leaks I find in ecommerce accounts is flows that are technically triggering fine but landing in Promotions or Spam. Run a free audit at unbury.co/audit to see where yours are actually ending up.