Klaviyo Best Practices: The 2026 Playbook

Quick answer: The Klaviyo best practices that separate high-performing accounts are: authenticate your domain, send to engaged segments first, get the core flows live before scaling campaigns, segment every send, turn Smart Sending off on cart/checkout flows, A/B test subject lines, run a sunset flow, design mobile-first, judge sends by revenue per recipient, and review performance monthly. Do these consistently and you’ll beat brands sending far more email.

Key takeaways

• Deliverability first: authenticate your domain and send to engaged people, or nothing else matters.
• Flows before campaigns: build the revenue baseline before chasing one-off sends.
• Segment everything — never blast the whole list.
• Measure on revenue per recipient, not opens.
• Run a monthly review rhythm so issues surface before they cost you.

You’ve got Klaviyo running — but are you doing it right? This playbook is the checklist we run on every account. It’s a cluster of our complete Klaviyo flows guide.

List hygiene and sunset rules

A clean list is the foundation of every other result. Emailing people who never open trains mailbox providers to filter you, which drags down even your best sends. Keep a sunset flow running that suppresses contacts with no email engagement in 90+ days (define unengaged by opens/clicks, not website browsing). Suppress dead weight on a schedule and your inbox placement climbs.

Segmentation discipline

Never send to “all subscribers.” Build and reuse your core Klaviyo segments and target every campaign to a relevant slice — engaged, category-interested, VIP. Segmented sends consistently outperform blasts on conversion and protect deliverability by keeping your engagement rates high.

Full flow coverage checklist

Make sure the core automations are live and correctly built — with conditional splits and exits, not just linear sequences:

If any of the “big four” (welcome, cart, browse, post-purchase) is missing or linear, fix that before optimizing anything else — it’s where the revenue is.

Deliverability fundamentals

• Authenticate your domain with SPF, DKIM, and DMARC on a dedicated sending domain.
• Warm up new domains by starting with your most engaged subscribers.
• Watch spam complaints and open trends as early-warning signals. Full detail in the deliverability guide.

Design and accessibility

• Mobile-first: most opens happen on phones — single-column layouts, large tap targets, readable type.
• One clear CTA per email; don’t make people choose.
• Alt text and a sensible text-to-image ratio so the email renders (and stays out of spam) even with images off.

Testing cadence (A/B)

Test the variable that moves the most revenue: usually the subject line (it sets the open-rate ceiling), then the offer and CTA. Change one meaningful thing per test, give it enough volume to reach significance, and keep the winner. Make testing a habit, not a one-off.

Reporting rhythm

Judge performance on revenue per recipient and flows-vs-campaigns revenue share, not opens — privacy changes have made open rates noisy. Track these monthly so trends surface early; the metrics that matter are in our Klaviyo metrics guide.

The 10-point monthly checklist

Run this once a month:

1. Domain still authenticated; deliverability healthy.
2. Sending to engaged segments; sunset flow active.
3. All core flows live with correct splits.
4. Smart Sending off on cart/checkout flows.
5. Campaigns segmented, not blasted.
6. At least one A/B test in flight.
7. Mobile rendering checked on recent sends.
8. Revenue per recipient trending up.
9. Flows contributing ~30%+ of email revenue.
10. Spam complaints below 0.1%, unsubscribes below 0.2%.

Klaviyo’s deliverability best-practices documentation is a useful companion reference.

Frequently asked questions

What are the most important Klaviyo best practices?

Authenticate your sending domain, send to engaged segments first, get the core flows live before scaling campaigns, segment every send, and judge performance on revenue per recipient rather than opens. These five do most of the heavy lifting.

Should I turn Smart Sending off in Klaviyo?

Turn it off on cart and checkout flows specifically, where it can suppress time-sensitive recovery emails. It’s fine to leave on for campaigns to avoid over-mailing.

How often should I review my Klaviyo account?

Monthly. Run a 10-point checklist covering deliverability, flow coverage, segmentation, testing, and revenue-per-recipient trends so problems surface before they cost you revenue.

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About the author

Ravinder is the founder of Excelohunt, a Klaviyo-focused email & SMS agency. This playbook is the checklist we run on client accounts.

Want an expert to run this playbook on your account? Book a free Klaviyo audit.