Ecommerce email & SMS marketing, the complete playbook.

You already paid to get people to your store. Email and SMS are how you make that money back more than once.

Most of the budget in ecommerce goes to the top of the funnel. Ads, influencers, whatever's getting people to the site. That's the expensive part, and it's the part everyone obsesses over. Meanwhile the cheapest, highest-return channel you own is sitting half-built in the background: the list of people who already raised their hand.

Here's the uncomfortable math. You spend real money getting someone to your product page. Most of them leave without buying. Of the ones who do buy, most never hear from you again. Every one of those is money you already spent that you're choosing not to collect. Email and SMS exist to collect it, and to keep collecting it long after the ad that found that customer stopped running.

Sources: Litmus / EmailMonday 2025, Omnisend. Your numbers will vary by list, offer, and how the channel is actually run.

That last line matters more than the stats. "Email makes $36 per dollar" is an average across brands that do it well and brands that batch-and-blast their whole list a discount every Friday. The gap between those two is enormous, and it's entirely in the execution. This guide is the execution.

1. The foundation nobody wants to build

Everyone wants to talk about clever subject lines. Almost no one wants to talk about the boring work that decides whether those subject lines ever reach a human. But the foundation is where most of the money is won or lost, so we start there.

List health and deliverability

Your list is not an asset because it's big. It's an asset because it's engaged. A list full of dead addresses and people who stopped caring two years ago doesn't just fail to make money, it actively drags down every email you send, because inbox providers watch how people react to you and score you accordingly. Send to a bloated, unengaged list and Gmail quietly starts routing you to spam, including for the people who do want to hear from you.

So the first job is hygiene. Clean out hard bounces, spam traps, and typo addresses using your platform's built-in tools or a service like Validity. Then build a "never engaged" segment and stop mailing it. The stricter providers, Outlook and Hotmail especially, will punish you for mailing people who never open, so filter anyone who hasn't engaged in roughly 80 days out of your regular sends. It feels like you're shrinking your list. You're actually protecting it.

Underneath that, get the plumbing right: SPF, DKIM, and DMARC authentication on your sending domain, and monitor where you're actually landing with tools like Google Postmaster and GlockApps. This is unglamorous and it is the difference between an email that gets read and an email that never existed. It's exactly the kind of thing that gets skipped, which is exactly why it's an edge.

Segmentation, in plain terms

A segment is just a bucket of people who share a behavior, and the behavior tells you what they need to hear next. You don't need forty of them. You need a few that matter.

By engagement, which decides how hard you talk to someone: active (opened or clicked in the last 30 to 90 days) gets everything. Warm (90 to 180 days) gets gentle re-engagement, treated like a friend who hasn't texted back in a while. Cold (180+ days) gets one honest re-engagement attempt, and if they don't bite, they get removed. Also exclude anyone who opted in or bought in the last 14 days from your regular campaigns, so their first experience of you isn't a firehose.

By relationship to buying, which decides what you say: buyers get brand building, new releases, and upsells. Non-buyers get objection handling, education, and proof. And the sneaky-valuable one, "clickers", people who clicked a product or sales link but didn't buy. That's raw intent. Chase it.

By purchase behavior, which is where ecommerce money hides. First-time buyers (their acquisition cost is already paid, so the whole game is getting the second order and, for consumables, a subscription). Repeat buyers (shift from education to expansion: bundles, cross-sells, reviews). Subscription customers (your most valuable and most fragile; more on them below). Lapsed buyers who know the product but haven't ordered in a while (re-engage them with what's new, not a discount). VIPs with five or more orders (early access, perks, the buying window extended).

Start with those buckets, send the right type of email to each, then layer topic and activity segments on top later. Scale comes from understanding the list, not from the size of it.

2. The five flows that run your revenue while you sleep

Campaigns are the emails you send on purpose. Flows are the emails that send themselves. Flows are where the "30x" number comes from, because they hit people at the exact moment of highest intent, forever, without you touching anything. Build them once and they welcome new subscribers, recover carts, and bring buyers back around the clock.

Most brands either don't have them or set them up once and never look at them again. If I could only fix one thing for a store, it would be these. Here are the five that carry the load, then the handful that quietly add more.

The welcome flow

Someone just signed up. This is the single warmest they will ever be, and most brands greet that moment with a bare "here's 10% off" and silence. The welcome flow is your first impression and often your first sale, and it deserves better than a coupon.

A good welcome sequence does three jobs across a handful of emails: it delivers whatever you promised at signup and makes the first purchase easy, it tells your brand story so people know why you exist and not just what you sell, and it sets the expectation that hearing from you is worth it. Lead with the identity and the outcome, meet the common objection, then make the offer. If you sell something consumable, the welcome flow is also your first, softest nudge toward a subscription.

The mistake to avoid: front-loading the discount so hard that you train people to only ever buy on sale. The discount can be there. It shouldn't be the whole personality.

Browse abandonment

This is the flow most stores skip, and it's a shame, because it catches people earlier than the cart. Someone looked at a product, showed real interest, and left without adding it. They're window shopping, which means they're curious but not convinced.

So don't hard-sell. Handle the hesitation. Bring back the exact product they looked at, add the one piece of proof or reassurance that closes the small gap between "interesting" and "I'll try it", a review, a guarantee, an answer to the obvious objection, and give them a frictionless way back. Browse abandonment won't convert like cart abandonment, but it's incremental revenue you were leaving on the table entirely, and it costs you nothing once it's built.

Abandoned cart

The heavyweight. Someone added to cart and didn't check out. They were one decision away. Something stopped them, and your job is to find out what and remove it.

The best cart flows aren't one nagging reminder. They're a short ladder where each email tackles a different reason people stall: the first is a simple, friendly "you left this," the next handles trust or a common question, the next addresses price or timing, maybe with a nudge, and a final one creates a little urgency before it closes. Treat it like a calm sales conversation, not a countdown clock screaming at them.

What's it worth? For most stores, the abandoned-cart flow alone recovers a meaningful chunk of revenue that would otherwise vanish, and because the person already showed the strongest possible intent, it converts far better than a cold campaign. If your store doesn't have a real cart ladder live right now, that's the first place I'd look for money.

Post-purchase and retention

Here's where most brands stop, and it's the most expensive place to stop. You just turned a stranger into a customer at real cost. The post-purchase flow decides whether that was a one-time transaction or the start of a relationship worth ten times as much.

Right after the sale, the goal isn't to sell again immediately. It's to make sure they actually use what they bought, because consumption drives everything downstream. A first-time buyer gets how-to content, the brand story, and a well-timed review request. Then, once they've had the product long enough to feel it work, you introduce the next step: the complement, the bundle, the subscription.

Subscription customers deserve their own paragraph because they're your most valuable and your most fragile. Someone on a subscription is quietly deciding to stay or leave every single cycle. You keep them not by selling, but by showing the product working, tying it to a real daily or seasonal problem, and helping them build a habit, because a routine is what actually lowers churn. And when someone is about to cancel, the smartest move is rarely to let them go. Train support to swap a churning subscriber into a better-fit plan or bundle. Saving a $300 lifetime customer who was about to walk is enormous ROI compared to chasing a new one.

One more that pays for itself: the review request, ideally with a small incentive. Done right it earns you a review and a repeat sale in the same email, and those reviews become the proof your next campaign runs on.

Win-back and reviving a dead list

Lists die two ways. Either they were never really mailed, or they got burnt out from being pitched too hard for too long. The fix is different depending on which one you're looking at, but the shape is the same: start with the warmest people and work outward, and lead with value, not another discount.

If a list was never used, start re-engagement from the most recent buyers, last 7 days, then 30, then wider, and clean off whoever won't come back. If a list got burnt out from daily "buy now" pitches, the counterintuitive answer is to keep mailing, but change what you're mailing about: how to use the product and what it can do for them, not buy-buy-buy. People stopped opening because you asked them to buy again before they'd finished what they had.

The revival move I trust: baseline the current open and click rates so you can prove improvement, then test on your most engaged 7-day segment first, keep the winners, and cascade those proven emails out to colder groups. You're not guessing at what works on a cold list. You're rolling out what already won on a warm one. And run this on a cadence, monthly or quarterly, because a healthy list is maintained, not fixed once.

3. Campaigns and cadence

Flows run in the background. Campaigns are the emails you plan and send: the launches, the promos, the stories, the seasonal pushes. The two work together. Flows capture intent; campaigns create it and keep you top of mind.

The cadence question, "how often should I email," has a boring right answer: often enough to stay a habit, not so often that you become noise, and always to the right segment. A simple rhythm that works for a lot of brands is to alternate relationship and offer: a value or story email, then a promotional one, then value, then offer. Holidays and seasons are built-in reasons to show up, so use them, but don't stack heavy promo on heavy promo. Your customers have finite buying power in any given month, and burning it all on back-to-back discounts trains the exact behavior you don't want.

The rule for any single send: one idea, one clear action. If you're trying to say five things, you'll land none of them. Front-load the point, make the ask obvious, and let the P.S. carry the soft version of it.

4. Email vs SMS: when to use which

SMS is not "email but pushier." It's a different room. Email is where you can tell a story, show the product, and give someone space to decide. SMS is intimate, immediate, and short, and people guard their text inbox far more than their email, so every message has to earn its place.

Use SMS for things that are genuinely time-sensitive and high-value: a cart about to expire, a flash sale, a shipping update, early access for VIPs, a back-in-stock alert. Use email for everything that needs room to breathe: the welcome story, the education, the campaign with images and detail. Many of your best flows run on both, with SMS carrying the urgent nudge and email carrying the substance.

And SMS isn't right for every brand. If your margins are thin or your audience doesn't want texts from you, it can cost more goodwill than it earns. I'll tell you honestly whether it's worth adding, because the wrong answer here annoys the exact customers you're trying to keep. Read the full breakdown of email vs SMS →

5. Klaviyo vs Attentive (and the honest answer)

The platform question gets more anxiety than it deserves. Klaviyo is the ecommerce standard for a reason: deep Shopify integration, strong flows and segmentation, and email plus SMS in one place. Attentive is a heavyweight built SMS-first, and it's excellent if SMS is central to your strategy. There are others, and they're mostly fine.

The honest answer is that the platform is rarely the thing holding a brand back. The strategy is. A world-class tool running a batch-and-blast strategy still loses to a decent tool running real flows and segmentation. I'll work in whatever you already use, or recommend the best fit if you're starting fresh, but I'm not going to pretend switching platforms is the fix when it usually isn't. Read the full Klaviyo vs Attentive comparison →

6. The copy that actually sells

You can have perfect deliverability, clean segments, and every flow live, and still make nothing if the words don't move anyone. Good email copy isn't clever. It's understanding what someone believes right now, and gently shifting one belief so that buying becomes the obvious next step.

A structure I lean on: name the outcome they want, name the old belief or problem standing in the way, show what it's costing them, offer the new belief, then show the how. Tie the product to who they want to be or the role they're trying to fill, so it reads as something they need to function, not a nice-to-have they can put off. And close soft. The hard "BUY NOW" has its place, but for a warm, emotionally aware audience, a permission-based close, a scenario they see themselves in, a soft P.S., often outperforms it, because the shift already happened earlier in the email and the link is just the next natural step.

Two practical things. First, if you're getting opens but no clicks, the message isn't landing deeply enough. Go past the surface benefit to the real pain or outcome, name it plainly, and give people a reason to act. Second, write like a person. Contractions, varied sentence length, specifics over adjectives, read it out loud. I use AI to move faster, but I don't let it think for me, and you can feel the difference in copy that does.

7. The numbers that matter

You can't improve what you don't measure, and email gives you cleaner numbers than almost any channel. The ones I actually watch, in order:

• Revenue per email and the split between flows and campaigns. If flows aren't carrying most of your automated revenue, they're not built right.
• Open rate, read as a signal of your subject line and your deliverability, never in isolation.
• Click rate, the honest test of whether the message resonated. High opens with low clicks means the promise got attention but the body didn't earn action.
• Conversion and AOV from email traffic, so you know the money is real and not just clicks.
• List growth and engagement trend, because a growing list that's getting less engaged is a slow leak.
• Unsubscribe and spam rate, your early warning that you're mailing too hard or the wrong people.

Numbers are signals, not problems. A dip in one metric points you to where to look. The job is to isolate the weakest link and fix one thing at a time, then let the next send tell you if it worked.

How I'd build this for you

Everything above is the what. Here's the how, and the honest version of what I've seen it do. I run email and SMS as a system, not as inspiration: I profile the audience and their real objections, I look at the data you already have, I build the flows and segments in whatever platform you're on, and I write the copy in a voice that sounds like a human wrote it. Then I read the numbers and keep adjusting, because the first version is never the best one.

It works. For one ecommerce brand, disciplined paid media plus the retention systems behind it added over $100,000 a month in revenue. For a meal-delivery brand, the recurring-revenue engine grew to around $50,000 a month. I keep client names private and the results real, and I'll show you the actual thinking on a call.

That's the whole point of the free diagnosis. I'll look at what flows you're missing, where your list is leaking, and what the fastest fix is worth, and you'll leave with a plan you can run yourself whether or not you ever hire me. If you'd rather I build it, that's what the email & SMS service is for. It also plugs into the rest of the system, the website that captures the traffic and the paid media that fills the top of the funnel, because email doesn't work in a vacuum.