The 5 Most Common Klaviyo Mistakes (and How to Fix Them)
Why It Matters
You're already paying for the traffic. These five mistakes are why that traffic isn't converting into revenue, and every one of them is a quick fix, not a rebuild.
Weak welcome flows waste your best shot at converting new subscribers — build 4-5 emails that each do something different
Blasting your whole list tanks deliverability — segment by engagement and only email people who actually open and click
Ignoring deliverability signals until you're in spam is too late — watch complaint rate, bounce rate, and click rate weekly
Generic pop-ups leak leads you already paid for — test two-step opt-ins and different offers
Campaigns competing with your flows steal revenue from your automations — exclude active-flow contacts from overlapping sends
Who This Is For
DTC brands and marketers running paid ads who haven't audited their Klaviyo flows in a while, or anyone whose email revenue isn't matching their list size.
If you’re spending heavily on paid ads for e-commerce brands, there’s a chance you could be leaving money on the table with your Klaviyo email program. David Sierraalta from Oaks Email Studio shared his email marketing experience with the Foxwell Founders community, breaking down the five most common Klaviyo mistakes and how to fix them:
1. Weak or Repetitive Welcome Flows
The Mistake: Most brands either send 1-2 emails in their welcome flow, or they stretch it to 5+ emails that all say the same thing (“Here’s your discount code!”), over and over.
Why It Hurts: The welcome flow is your best shot at converting a new subscriber. If it’s short or boring, you’re wasting prime inbox real estate and customer attention span.
Quick Fix:
Build out a welcome series with four or five emails, but make sure each one actually accomplishes and communicates something different. One might tell your brand story, another drops some customer reviews, another answers FAQs, and the rest can be reminders or quick tips. The goal is to keep it fresh so people don’t tune out.
Turn off Smart Sending for the first email so new subscribers get their offer immediately.
Test single vs. double opt-in for best results.
2. Blasting Your Whole List Instead of Segmenting
The Mistake: Sending every campaign to your entire email list, regardless of engagement.
Why It Hurts: Inbox providers (Gmail, Yahoo, etc.) care about engagement. If a big chunk of your list never opens or clicks, your sender reputation tanks, and even your most loyal fans stop seeing your emails.
Quick Fix:
Segment your list by how recently people have opened or clicked your emails. Only send your main campaigns to folks who’ve engaged in the last 30, 60, or 90 days. This ensures you’re talking to people who actually want to hear from you, and your list stays healthy.
Run “sunset flows” to try to re-engage cold subscribers, then suppress or remove them if they don’t bite.
Note: Don’t stress if your list shrinks a bit. Your revenue per person will actually go up.
3. Ignoring Deliverability Signals Until It’s Too Late
The Mistake: Not monitoring key deliverability metrics until your emails start landing in spam.
Why It Hurts: By the time you notice, the damage is done, and recovery can take weeks or months.
Quick Fix:
Routinely check your Klaviyo deliverability score.
Watch your spam complaint rate (keep it below 0.1%), bounce rate (below 0.5%), and click rate (which matters more than open rate these days).
Clean your list frequently.
Stop copy-pasting playbooks into ChatGPT. Give your AI direct access to the Founders knowledge base with Foxwell MCP.
4. Pop-Ups That Don’t Convert
The Mistake: Using a generic one-step pop-up ("Get 10% off!") that shows to everyone, everywhere, and doesn’t convert.
Why It Hurts: You pay for every site visitor, and if your pop-up isn’t pulling its weight, you’re losing valuable leads.
Quick Fix:
Try a two-step pop-up (email first, then SMS for a juicier offer).
Switch up your offers, test a percentage off, a set dollar amount, free gifts, or even early access to new stuff. Watch what actually gets people pumped and let that steer your next move.
Design different pop-ups for desktop and mobile.
Personalize pop-ups based on where people are on your site.
5. Campaigns Cannibalizing Flow Revenue
The Mistake: Sending campaigns to people who are already in high-converting flows (like cart abandonment or welcome), often with overlapping or even competing offers.
Why It Hurts: Campaigns can steal revenue from your flows, so it looks like your automations aren’t working. Even though you’re just double-messaging the same people.
Quick Fix:
Exclude contacts who are currently in a flow from receiving campaigns with similar offers.
Keep your eye on total program revenue, not just what’s coming from campaigns. That’s how you see the real story.
Plan campaigns around gaps in your flows, not on top of them.
Rapid-Fire Tips from the Q&A
Track Click Rate, Not Open Rate: Apple’s iOS privacy changes have made open rates unreliable. Clicks are a better engagement metric.
Don’t Fear a Smaller List: It’s better to have a smaller, more engaged list than a large one with people who aren't paying attention, or don't want to be there.
Design Help: Canva and Pinterest are your friends for inspiration and easy templates.
Test Everything: Let the data decide what works when making decisions about anything from pop-up offers to audience segments,
Where to Start This Week
Audit your welcome flow and ask yourself if each email serves a purpose.
Build engagement tiers and suppress unengaged contacts.
Review your pop-up conversion rate and test a new offer.
Check your deliverability dashboard for red flags.
Make sure your campaigns aren’t overlapping with active flows.
Final Takeaway: Most Klaviyo mistakes are totally fixable once you know what to look for. Start with your welcome flow, clean up your list, and try out new pop-ups. The data will show you what’s working. You just have to listen.
Stop guessing at your Klaviyo flows. Foxwell Founders puts you in a room with people who've already fixed these mistakes.
Note: This blog was written by a human, but AI helped draft the outline and synthesize ideas.
