An effective email and SMS marketing strategy is not about deciding which channel wins. It is about sequencing the right message, for the right customer, at the right moment—using email to create context and SMS to make the next action feel timely.
That is the core lesson in a Klaviyo Academy video on combining campaigns: email and text work best as complementary parts of one launch, rather than isolated blasts competing for attention. The practical opportunity is bigger than simply sending an email followed by a text. Marketers need to design a journey with a clear handoff between discovery, consideration, urgency, and conversion. (youtube.com)
Why email and SMS should have different jobs
Email remains the better canvas for a product story. It can accommodate product photography, comparisons, reviews, editorial context, FAQs, multiple calls to action, and the brand voice that helps a shopper understand why a launch matters.
SMS is a more constrained, more immediate medium. A short text and a direct link are particularly useful when the customer already has the necessary context and needs a reason to act now—such as a limited inventory update, a final-hours promotion, an event reminder, or a back-in-stock alert.
Klaviyo Academy illustrates the distinction with a fictional coffee brand, Beantown: introduce a limited-edition fall blend through a rich launch email, then send an SMS reminder three days later only to people who opened but did not buy. That is a strong model because the second message does not repeat the first one; it changes the objective from storytelling to action. (youtube.com)
The wider platform market is moving in the same direction. Klaviyo now frames omnichannel campaigns as coordinated journeys across channels based on real-time behavior, while Mailchimp is also positioning unified customer data, automation, email, and messaging as a single ecommerce growth workflow. The implication for smaller teams is clear: channel coordination is becoming a baseline capability, not an enterprise-only project. (klaviyo.com)
Build an email and SMS marketing strategy around behavior
The most important word in the Beantown example is not “three days.” It is targeted. A time delay may be useful, but behavioral conditions make the follow-up relevant.
Instead of giving every email recipient the same text message, build the campaign around what each person did—or did not do. Start with a simple decision tree:
- Send the launch email to eligible email subscribers.
- Exclude recent purchasers so customers do not receive a sales nudge for something they have already bought.
- Wait long enough to observe engagement, based on your typical buying cycle and campaign velocity.
- Send SMS only to opted-in subscribers who engaged with the email or product page but did not complete a purchase.
- Suppress non-engagers or recently messaged customers to prevent needless frequency and fatigue.
- Stop the sequence immediately after purchase and move the customer into post-purchase education, delivery updates, or cross-sell logic instead.
This approach makes the SMS message feel like a useful continuation, not a brand following someone around the internet. It also avoids wasting a high-attention channel on people who have shown no interest in the offer.
Modern omnichannel tools increasingly support this kind of orchestration in one workflow, including audience-specific messages and channel-level coordination. But the technology is not the strategy. The strategy is the rule that determines who should hear what next. (klaviyo.com)
A practical launch sequence for ecommerce brands
For a product release, sale, or seasonal collection, use a campaign structure that reflects how purchase intent develops.
Phase one: build interest with email. Send an email that answers the questions a shopper needs answered: What is new? Why is it different? Who is it for? What makes it timely? Use one primary CTA, but allow the content to do the explanatory work.
Phase two: identify warm intent. Create an audience of customers who opened or clicked the email, viewed the relevant product, or started checkout—then remove anyone who has purchased. This is the group most likely to benefit from a concise prompt.
Phase three: create legitimate urgency with SMS. The text should introduce new information, not merely say “Did you see our email?” Examples include a real deadline, dwindling availability, an expiring offer, or a reminder tied to a customer action. Keep the destination frictionless: one message, one link, one next step.
Phase four: adapt rather than escalate. If someone does not convert after the text, do not automatically send another urgent message the following day. Consider a different angle in email—social proof, product education, a bundle, or a customer review—rather than turning up the pressure.
This sequence is especially useful for brands with visual or considered products. A skincare launch may need ingredients and routine guidance in email before a text says the introductory bundle ends tonight. A fashion label can use email for styling and fit details, then use SMS to alert high-intent shoppers that a size is selling through.
Measure incremental lift, not just channel revenue
A common mistake is treating every SMS order after a campaign as proof that SMS “caused” the sale. Customers may have converted anyway after seeing the email, organic social content, paid ads, or the product page.
A better measurement plan separates performance into three questions:
- Reach and engagement: Did the email generate opens, clicks, and product exploration? Did the SMS generate link clicks from the intended segment?
- Conversion efficiency: What percentage of the eligible follow-up segment purchased after receiving the text?
- Incrementality: Did the coordinated journey produce more revenue, orders, or profit than email alone would have produced?
Where volume permits, retain a small randomized control group of qualified customers who receive the email but not the SMS. Compare purchase rate, revenue per recipient, unsubscribe rate, and repeat purchase behavior against the SMS-exposed group. This will not create laboratory-perfect attribution, but it is far more useful than assigning all post-click revenue to the final touchpoint.
Also watch for negative signals. A short-term conversion bump is not automatically a win if SMS opt-outs rise, complaint rates increase, or email engagement falls after frequency climbs. Klaviyo itself emphasizes using coordinated campaigns to avoid message overlap and fatigue, which should be a core guardrail in any cross-channel test. (klaviyo.com)
Compliance and trust are part of the strategy
SMS is powerful partly because it is personal, which makes permission and message discipline non-negotiable. In the U.S., marketing texts are subject to TCPA-related consent requirements; brands should obtain explicit SMS consent, maintain records, provide clear opt-out paths, identify themselves, and respect sending-time restrictions. Requirements can vary by jurisdiction and use case, so legal counsel should review a program before launch. (help.klaviyo.com)
Do not assume email permission equals text-message permission. Klaviyo’s consent guidance specifically recommends collecting SMS opt-in separately, such as through a distinct checkbox or button. For email, CAN-SPAM requires commercial senders to provide recipients with a way to opt out, and the FTC also prohibits deceptive subject lines and misleading header information. (help.klaviyo.com)
Trust also improves performance. Make frequency expectations clear at sign-up, honor opt-outs promptly, use quiet hours, and avoid inventing scarcity. An “ending tonight” text should only go out when the offer genuinely ends tonight.
The best email and SMS marketing strategy is one conversation
Klaviyo Academy’s email-first, SMS-follow-up example is valuable because it treats channels as stages of one conversation. Email gives a product its story; SMS gives an already interested customer a timely reason to decide.
Start simple: choose one product launch, define the behavioral segment that earns a text follow-up, write one genuinely useful SMS message, and compare the result with an email-only control group. When the message, audience, timing, and consent rules work together, omnichannel marketing becomes less about sending more—and more about making each send matter.