I need to say something that’s going to upset a lot of email agencies.
Your Klaviyo post-purchase flow isn’t fixing your retention problem. It’s masking it.
And the agencies selling you “ReTeNtIoN MaRkEtInG” based on email sequences alone are missing the point entirely.
The New Wave of “Retention Agencies” That Aren’t
Over the past two years, I’ve seen dozens of email agencies rebrand themselves as retention experts. They promise better customer lifetime value through optimised post-purchase flows, win-back campaigns, and loyalty integrations. And success is fuelled by good quality product, irrespective of whether a customer clicks, buys or not. That’s the way Klaviyo attribution’s setting can be ‘optimised’ for the agency (I know, I fix this problem all day long)
Their pitch sounds good:
“We’ll 10x your sales building you a complete Klaviyo retention strategy with 47 flows that nurture customers from first purchase to brand advocate.”
Here’s what actually happens:
You implement their flows. Open rates look decent. Click rates are acceptable. You might even see a small uptick in repeat purchase rate. Attributed revenue looks great… until you then stumble on attribution settings.
Six months later, you’re still haemorrhaging customers after their first order. Your repurchase rate is still under 20%. And you’re back spending more on acquisition because retention “didn’t work.” That’s not data Klaviyo reports on. I’m not knocking Klaviyo here. Far from it (it’s a platform I’ve worked with for nearly 10 years now).
The problem isn’t the flows. The problem is thinking flows equal retention.
Retention Isn’t an Email Problem
Let me be direct about this.
If your customers aren’t coming back, it’s not because your post-purchase email sequence needs more personalisation tokens or better subject lines.
It’s because something in your actual business isn’t working.
Maybe:
- The product didn’t live up to the promise on your product page (reason no.1)
- The first delivery experience was forgettable
- They can get it faster on Amazon (and cheaper?)
- Customer service took three days to respond
- The product itself doesn’t warrant repurchase
- The discounted price doesn’t match the perceived value (reason no.2)
- There’s no clear reason to buy again
- The usage experience was confusing
- They’re now overstocked
- The brand feels transactional, not relational
I could go on. You can’t email your way out of any of these problems.
What Klaviyo Actually Does (And Doesn’t Do)
Klaviyo is brilliant at what it’s designed for: communication at scale.
It can:
- Send the right message to the right person at the right time
- Automate replenishment reminders
- Trigger based on customer behaviour
- Segment audiences intelligently
- Personalise content dynamically
What it cannot do:
Make a mediocre product worth buying twice
- Create an experience customers want to repeat
- Build emotional connection where none exists
- Fix broken expectations set during acquisition
- Turn a transactional brand into a relationship brand
- Generate loyalty where trust hasn’t been earned
Klaviyo is an amplifier. If your retention fundamentals are weak, you’re just amplifying weakness.
The Real Retention Stack
Here’s what drives customers to return to ecommerce brands:
Product-market fit for repeat purchase
Does your product naturally fit into someone’s routine? Is there a logical reason to buy again? If you’re selling something people buy once every five years, no post-purchase flow will change that reality.
Expectation vs reality alignment
Did the product do exactly what your product page promised? If there’s a gap between what acquisition messaging sold and what the product delivered, retention dies right there. Before any email is opened.
First order experience design
The unboxing. The first use. The first moment of value. The ease of the entire journey. This is where retention is won or lost. Not in an email three days later. Was it simply ‘forgettable’?
Communication quality (not quantity)
It’s not about having 47 flows. It’s about whether your communication feels human, helpful, and actually relevant to where someone is in their journey with your brand.
Customer service as a retention lever
How you handle problems, questions and complaints tells customers whether you’re worth staying with. One bad support interaction kills more retention than a great email flow creates.
Repurchase friction and mechanics
How easy is it to buy again? Do I need to hunt for the product? Remember which variant I ordered? Navigate a clunky checkout again? Friction kills repeat behaviour.
Pricing and value consistency
If I paid full price last time and now see the same product discounted 40% for new customers, why would I feel good about buying again at full price?
The Klaviyo Agency Retention Playbook (And Why It’s Limited)
Most agencies following the “retention marketing” playbook are building something like this:
- Post-purchase thank you flow
- Educational content series
- Replenishment reminder flow
- Review request flow
- Cross-sell sequence
- Win-back campaign
- VIP tier communication
- Birthday/anniversary flows
- Browse abandonment
Don’t get me wrong, This isn’t ‘not wrong’ it’s just that these flows only support retention when the fundamentals are solid.
But they’re treating symptoms, not causes.
If customers aren’t repurchasing? Adding another email to the sequence won’t fix it.
You need to go upstream to where retention actually breaks.
Where Real Retention Work Happens
Retention starts long before Klaviyo enters the picture.
In product selection and positioning
Are you selling products people need repeatedly? Is the value proposition clear and compelling for the second purchase, not just the first?
On product pages
Are you setting accurate expectations? Showing real use cases? Building trust before checkout? Making it clear what happens after purchase?
In fulfilment and delivery
Speed matters. Packaging matters. Accuracy matters. The physical experience of receiving your product is a retention moment.
In first-use experience
Does the customer know how to use the product? Get value immediately? Feel confident in their purchase? Understand when to buy again?
In customer service
Response time, tone, problem-solving ability, proactive communication. These aren’t nice-to-haves. They’re retention infrastructure.
In ongoing product experience
Quality consistency. Reliability. Performance over time. Meeting or exceeding expectations on every order.
In brand behaviour and values
Do you show up consistently? Keep your promises? Treat customers fairly? Act like you want a relationship, not just a transaction?
This is retention work. Strategic, foundational, cross-functional retention work.
What Happens When You Fix Retention Fundamentals?
I’m running retention audits with brands that were spending thousands per month on email marketing, running sophisticated Klaviyo setups and still seeing terrible repeat rates.
Then they fixed the actual retention problems:
One brand rewrote their product pages to set clearer expectations. Repeat rate went from 18% to 31% in four months. No email changes.
Another brand redesigned their first order packaging to include proper usage instructions and replenishment guidance. Customer lifetime value increased 43%. Same post-purchase flow.
Another brand fixed their customer service response times and trained their team to be genuinely helpful. Couldn’t set a clear KPI on this, but repeat purchase rate jumped. Win-back emails became less necessary.
The common thread: they stopped trying to email their way to retention and started building experiences worth returning to.
When Klaviyo Post-Purchase Flows Actually Work
Let me be clear about this because I’m not anti-email or anti-Klaviyo.
Post-purchase flows work brilliantly when:
- The product experience is already strong
- Customers are naturally inclined to repurchase
- The brand has established trust and credibility
- Communication adds genuine value
- The timing aligns with actual customer needs
- You’re reinforcing good behaviour, not compensating for bad experience
In these cases, Klaviyo flows accelerate what’s already working. They remind, nudge, educate and deepen relationships.
But they cannot create retention where the fundamentals don’t exist.
The Honest Retention Audit
If you’re wondering whether your retention problem is an email problem or a business problem, ask these questions:
- When customers do repurchase, is it because of your emails or despite them?
- If you turned off all post-purchase flows tomorrow, would your repeat rate collapse or stay roughly the same?
- Are you getting complaints about product quality, delivery, or service that email sequences can’t address?
- Do customers who never open your emails still come back to buy?
- Is your repeat purchase rate improving because of better flows or better product-market fit?
- If customers aren’t repurchasing, have you actually asked them why?
The answers will tell you where the real work needs to happen.
What Retention-First Actually Means for Ecommerce
Building retention into your ecommerce business means:
- Designing products that naturally drive repeat behaviour
- Creating first-order experiences that exceed expectations
- Building trust through consistent quality and service
- Making repurchase effortless and obvious
- Earning loyalty through behaviour, not points schemes
- Communicating like a brand customers choose to hear from
- Measuring retention metrics that matter (not just email metrics)
Email supports this. Email enhances this. Email can optimise this.
But email doesn’t create this.
Back to those Retention Marketing Agencies…
Most agencies calling themselves retention experts are email experts with a new positioning. We’ve seen this dozens of times in the ecommerce world the past 2 decades. SEO Consultants now becoming GEO Consultants? Yep, it’s there too.
That’s not necessarily bad. Email expertise is valuable.
But it’s not retention expertise.
Real retention expertise understands:
- Product strategy and positioning
- Customer psychology and behaviour
- Post-purchase experience design
- Operations and fulfilment
- Customer service systems
- Brand strategy and positioning
- Cross-functional implementation
- Business model economics
This goes far beyond Klaviyo flow optimisation.
What You Actually Need
If you’re serious about retention, here’s what to prioritise:
Start with diagnosis
Why aren’t customers coming back? Ask them. Look at the data, pre- and post-purchase (highly recommend setting up Fairing.co for key post-purchase insight). Audit the actual experience. Find the real blockers.
Fix the experience
Product quality. Delivery reliability. Service responsiveness. Usage clarity. Value alignment. These are your retention foundations. Using Gorgias? Get access – these are insights way beyond customer service teams (not offence meant CSMs…)
Design for repeat behaviour
Make it obvious when to buy again. Remove friction. Reward good behaviour. Build habits, not dependency.
Then optimise communication
Once the fundamentals work, use Klaviyo to enhance, remind, educate, and deepen relationships.
In that order.
Not the other way around.
Moving Forward
If you’ve hired a “retention agency” that only talks about email flows and segmentation, you haven’t hired a retention agency. You’ve hired an email agency.
That might be exactly what you need if your retention fundamentals are solid.
But if customers aren’t coming back and the proposed solution is “better Klaviyo flows,” you’re solving the wrong problem.
Retention is built into how your entire business operates. It starts with product selection. Lives in your product pages. Gets reinforced through delivery. Strengthens through customer service. Compounds through consistent experience.
Email is the communication layer on top of that foundation.
Build the foundation first.
I repeat Build the foundation first.
Then build the communication strategy that amplifies it.
Because no matter how sophisticated your Klaviyo setup is, you can’t email your way to retention when the experience isn’t worth repeating.
That’s not a marketing problem.
That’s a business problem.
And it requires business solutions, not just better flows.
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