Why Your Klaviyo SMS and Email Flows Are Competing Against Each Other (And Costing You the Sale)

The Problem Nobody Talks About in Multi-Channel Automation

Most Shopify brands that reach $3M to $10M in revenue have both email and SMS running in Klaviyo. They set up their abandoned checkout email flow. They add an SMS abandoned checkout sequence. They feel good about the coverage. Then they wonder why their recovery rate is flat or, worse, why unsubscribe rates on SMS keep climbing.

The issue is almost never the copy. It is almost never the timing in isolation. The issue is that email and SMS are firing at the same customer, about the same product, within hours of each other, with no coordination between them. They are not a multi-channel strategy. They are two separate funnels pointed at the same person, and that person can feel it.

We see this in nearly every audit we run on stores that have been operating for more than 18 months. The brand added SMS later, plugged it into existing flows, and never went back to redesign the logic around the full communication picture.

What Overlap Actually Looks Like in Practice

Here is a real pattern we see repeatedly. A customer abandons checkout on a Tuesday at 2pm. The email flow sends the first message at 2 hours, the second at 24 hours, and the third at 72 hours. The SMS flow, set up separately, sends a text at 30 minutes, another at 4 hours, and a final one at 48 hours.

That customer receives six total messages across three days. Two of them land within the same two-hour window on Tuesday afternoon. Both mention the same cart. Both have a link back to the same product page. One has a discount code and the other does not.

Now the customer is confused. Are these the same offer? Should they wait for a better deal? Is this brand desperate? The answer to that last question, even if it is subconscious, is often yes. Frequency without coordination reads as desperation, and desperation erodes the perceived value of what you are selling.

We have seen brands where SMS opt-out rates were sitting above 4% on abandoned checkout sequences alone. When we mapped the send timeline against the email flow, the overlap was obvious. The fix was not better SMS copy. It was rebuilding the sequencing so the two channels were working in shifts, not parallel.

How to Redesign the Sequencing Logic

The goal is to treat email and SMS as one conversation with a customer, not two separate conversations happening to the same person at the same time.

The simplest version of this is a shift-based model. SMS owns the first four hours. It is fast, direct, and designed for people who are still in a buying mindset. After that window, email takes over for the longer-tail recovery, where you have more room to handle objections, show reviews, or present alternatives.

In Klaviyo, you can build this with flow filters and conditional splits. If someone gets an SMS in the first four hours, suppress them from the first email in the sequence. Let the email flow pick them up at the 24-hour or 48-hour mark instead. You are not removing touchpoints. You are spacing them so each one has room to land.

A slightly more advanced version uses engagement signals to decide which channel goes first. If the customer opened your last three emails but has never clicked an SMS link, email should lead. If their SMS click rate is strong but their email open rate is under 20%, flip the order. Klaviyo's profile data and predictive analytics give you enough signal to make this call dynamically, especially if you are running conditional splits based on engagement history.

The key shift in mindset here is that more messages is not the same as more recovery. The question is whether the messages are additive or repetitive. Repetitive messages do not compound. They decay.

The Discount Consistency Problem

One specific failure mode we want to call out is discount inconsistency across channels. We see this constantly and it does real damage to margin and perceived brand value.

Email sends a 10% code at hour 24. SMS sends a 15% code at hour 4. The customer who sees both now knows that waiting pays off. You have just trained a portion of your list to delay purchases and hold out for better offers. More importantly, you have done it accidentally, with no strategic reason behind it.

The fix is a single discount logic that applies across both channels, managed at the flow level rather than the individual message level. If you are going to offer a discount at all, decide at the sequence level whether it appears and when. Do not let the email team and the SMS team set their own incentive structures independently. We have worked with brands where the two channels were being managed by different contractors who had never compared notes, and the result was a discount ladder that no one had intentionally designed.

If you do not want to audit every active flow manually, pull a report in Klaviyo that shows all active discount codes tied to flows, then map them against the send timeline by channel. Gaps and contradictions will surface quickly.

What Good Coordination Looks Like at Scale

Brands doing this well treat their Klaviyo flows as a single communication calendar per customer segment, not a collection of independent automations. They ask: what is this customer experiencing across all touchpoints this week, and does that experience make sense?

That question gets harder to answer as you add more triggers and more flows. A customer can be in an abandoned checkout flow, a post-purchase flow, and a winback flow simultaneously if the timing overlaps. Adding SMS to that picture without a suppression and exclusion strategy means some customers are getting seven to ten automated messages in a week from a brand they bought from once.

The brands that get this right build a message cap at the contact level, typically three to five automated messages per week across all channels combined, and they enforce it with Klaviyo's smart sending settings and custom flow filters. They also audit their active flows on a quarterly basis, not to rewrite copy, but to check whether the sequencing still makes sense given everything else that is running.

That discipline is not complicated, but it requires someone to own the full picture rather than managing email and SMS as separate programs.

If you are unsure whether your flows are working together or against each other, a full conversion audit is usually the fastest way to find out. We map every active flow against your customer journey and show you exactly where the friction is coming from.