Most Shopify stores are not missing revenue because their email strategy is broken. They are missing revenue because they are asking one channel to do the work of two.
The Channel Combination Most Shopify Stores Are Completely Ignoring
Here is a scenario that plays out thousands of times every day across Shopify stores running email-only marketing programs.
A customer abandons their cart. Your abandoned cart email fires 45 minutes later — perfectly timed, well-written, showing exactly the product they left behind. It lands in their inbox.
They do not see it.
Not because it went to spam. Not because the subject line was weak. But because at that exact moment, they are on their phone, scrolling, moving, distracted — and your message is sitting unopened in an inbox they may not check for hours.
This is the gap that Klaviyo’s combined SMS and email strategy closes. And for Shopify stores that understand how to use both channels together — not as separate programs running in parallel, but as one coordinated system — the revenue impact is not minor. It is transformational.
Email and SMS should not behave like two different marketing teams. They should work like one system with two different delivery methods.
Why SMS and Email Are Not Competing Channels — They Are Complementary Ones
The most common misconception is that SMS will cannibalize email revenue. That if you reach people through both channels, you are just splitting the same results across two places.
That is wrong.
Email and SMS do not reach the same customer in the same context. They reach the same customer in different moments, with different attention patterns, and with different kinds of communication that perform differently in each channel.
Email is a considered channel
Subscribers engage with email when they have time to read. Email is ideal for richer content — product education, story-driven campaigns, curated product selections, launch announcements, and detailed promotions with multiple options.
SMS is an immediate channel
SMS is read fast, on the lock screen, in real time. It is ideal for urgency, simplicity, and direct action — flash sale alerts, abandoned cart reminders, back-in-stock notifications, shipping updates, and last-chance prompts.
Why this matters
When these two channels are coordinated properly, your brand becomes much harder to miss and much easier to act on.
The Numbers That Make the Case
Before strategy, it helps to understand why the model works so well.
- SMS messages often see open rates near 98%
- Email averages far lower reach than SMS in the first few hours
- Abandoned cart flows using SMS + email recover significantly more revenue than email-only flows
- Customers active on both channels tend to have higher lifetime value than email-only subscribers
Revenue per SMS message may be lower than revenue per email campaign, but revenue per SMS subscriber is often strong because the engagement rate is dramatically higher.
The goal is not replacing email with SMS. The goal is using SMS to catch the moments email naturally misses.
The Foundation: Building Your SMS List the Right Way
Before any strategy is possible, you need a compliant and high-quality SMS list.
Compliance is foundational
SMS marketing has stricter legal requirements than email in most markets. Subscribers must explicitly opt in to marketing texts. That opt-in must clearly explain what they are signing up for, how often they may hear from you, and how to opt out.
Opt-in methods that work
- Dual email + SMS pop-up capture
- Checkout opt-in
- Post-purchase opt-in invitation
- Keyword opt-in from social, packaging, or other channels
The quality principle
As with email, list quality matters more than list size. A smaller SMS list with strong intent will outperform a larger, low-trust list built with weak expectations.
Your opt-out rate after the first SMS is one of the clearest indicators of whether your opt-in promise and message quality are aligned.
The Core Strategy: How SMS and Email Work Together
The central principle is simple: use the channel that is most appropriate for the specific message at the specific moment.
This turns into three coordination patterns.
Pattern #1: Channel Sequencing
This means one channel goes first, and the second follows only if the subscriber did not engage.
The abandoned cart flow is the best example. Email fires first because it can show the product, reinforce the value, and create a richer return-to-cart experience. SMS follows only for non-openers or non-engagers — catching people the inbox missed.
Pattern #2: Channel Specialization
Email should carry richer content. SMS should carry urgency, immediacy, and simplicity.
Stores get into trouble when they compress email campaigns into text messages. That creates repetition, not value.
Pattern #3: Channel Reinforcement
Both channels support the same campaign, but they do not say the same thing in the same way. Email tells the fuller story. SMS delivers the alert that something important is happening now.
We can map the right SMS + email system for your store.
If you are unsure where SMS fits into your current flow setup, we can show you exactly where it creates the highest lift.
The 5 Flows That Need Both Channels
1. Abandoned Cart
This is the highest-priority integration. Email goes first. SMS catches the people who never opened or acted on the email.
2. Welcome Series
Use the email welcome flow to establish trust and value. Use SMS to reinforce key urgency moments, discount reminders, or quick onboarding nudges.
3. Back-in-Stock
SMS often outperforms email here because speed matters. If the product returns and sells fast, the lock-screen notification creates a real advantage.
4. Win-Back
If email has failed repeatedly, SMS can become the final escalation layer to re-open the relationship.
5. VIP / Loyalty
Best customers should get a more immediate and exclusive experience. SMS is powerful for early access, special restocks, loyalty milestones, and limited releases.
The Mistakes That Kill SMS and Email Program Performance
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Sending SMS too frequently SMS has lower tolerance than email. Every text must feel worth interrupting someone’s day for.
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Duplicating email content in SMS If the text says the same thing as the email, subscribers do not feel served. They feel spammed.
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Not suppressing correctly across channels If someone already purchased, they should not keep receiving follow-up reminders from the same flow.
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Treating SMS opt-out like total brand rejection Someone may opt out of SMS and still remain a valuable email subscriber.
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Launching without a clear value proposition Subscribers need to understand why receiving texts from your brand is worth it.
What Coordinated SMS and Email Looks Like in Practice
A strong weekly system does not send more for the sake of sending more. It coordinates intent, timing, and channel role.
- Monday: welcome flow emails continue, no SMS unless relevant
- Tuesday: flash sale SMS sends first, campaign email follows with richer content
- Wednesday: abandoned cart email + SMS flow continues automatically
- Thursday: last-chance SMS only to non-purchasers
- Weekend: back-in-stock SMS fires immediately, email follows after
Simple idea
Good coordination is not about volume. It is about reaching the right customer through the right channel before intent disappears.
The Revenue Math: What Adding SMS Actually Generates
For many stores, the revenue lift does not come from one huge change. It comes from multiple smaller recoveries happening consistently:
- More abandoned carts recovered
- More back-in-stock purchases captured in time
- Higher response from urgent flash sale traffic
- Better retention from stronger cross-channel visibility
When SMS supports email instead of competing with it, the additional revenue stacks without reducing email’s core role.
Getting Started: The 30-Day SMS Launch Plan
Week 1 — Compliance and setup
Configure Klaviyo SMS properly for your market. Set up your sender, your compliance language, and your opt-in structure.
Week 2 — List building and first message
Launch your SMS capture system and send your first welcome-oriented text to properly consented subscribers.
Week 3 — Abandoned cart SMS integration
Add SMS to your abandoned cart flow using non-opener or non-engager logic.
Week 4 — Campaign integration and measurement
Launch your first coordinated SMS + email campaign and establish baseline metrics for revenue, clicks, and opt-outs.
The Bottom Line
Email and SMS are not competing channels. They are complementary channels that reach the same customer in different ways and at different times.
Stores that understand this — and build both channels into one coordinated retention system — consistently outperform stores relying on one channel alone.
The technology is already inside Klaviyo. The strategy is clear. The upside is real.
The question is not whether SMS should replace email. The real question is how much revenue your store is still losing by asking email to do everything by itself.
