Klaviyo Sending Domain Warmup:
Learn how to properly warm up your sending domain in Klaviyo to build reputation, improve deliverability, and protect your brand’s email performance.
If you’ve just set up your sending domain in Klaviyo, high five. But before you blast out a campaign to your entire list, there’s one more step you can’t skip, warming up your domain.
Why? Because inbox providers (like Gmail and Outlook) don’t trust new domains. Without a warm-up period, your emails could end up in spam, hurting your deliverability long term.
Here’s how to warm it up properly, step-by-step.
💡 What Is Klaviyo Sending Domain Warmup?
Domain warming is the process of gradually increasing the volume of emails sent from a new domain to build a positive sender reputation.
Think of it like weight training. If you walk into the gym and try to deadlift 200kg on day one, you’ll probably injure yourself. Same thing with email go too hard, too fast, and inboxes will block or throttle you.
🧠 Why do we need Klaviyo Sending Domain Warmup?
- 🚫 Avoid spam folder placement
- 📬 Build trust with inbox providers
- 🔒 Protect your sender reputation
- 💸 Maximise inbox placement = more revenue
Especially with Klaviyo’s deliverability power, you want to keep that momentum going, not wreck it on day one.
🛠 How to Warm Up Your Domain in Klaviyo (Step-by-Step)
Step 1: Set Up Your Dedicated Sending Domain
Make sure you’ve already authenticated your domain via Klaviyo settings (SPF, DKIM, etc.). Here’s how to do that →
Step 2: Send to Your Engaged Segment First
Start with your most engaged contacts, the ones who have:
- Opened or clicked an email in the last 30 days
- Recently purchased
- Joined your list via high-intent actions (like a quiz or product waitlist)
✅ Pro Tip for Klaviyo Sending Domain Warmup: In Klaviyo, create a segment using filters like:
“Opened email at least once in the last 30 days” AND “Placed order at least once in the last 90 days”
Step 3: Start Small & Scale Gradually
Here’s a sample warm-up schedule to follow:
🧠 Important: Watch your open rates. If they tank (below 15–20%), slow down. Prioritise engagement over volume. If you need assistance, reach out to us.
Step 4: Use Flows First (Optional, but Smart, depending on how fast you want to warmup your sending Domain)
Flows like welcome series, post-purchase, and browse abandonment tend to have higher open rates and can be great for warming up.
You can:
- Turn on automated flows for engaged users
- Delay big campaigns until after a few thousand emails have been sent via flows
Step 5: Monitor Key Metrics Daily
Keep an eye on:
- 📬 Open rate (goal: 25–35%)
- 📉 Bounce rate (under 2%)
- 🚫 Spam complaints (under 0.1%)
Use Klaviyo’s Deliverability tab and inbox tools like Postmaster Tools to track performance.
⚠️ Common Mistakes to Avoid
- ❌ Sending to your full list on day one
- ❌ Including cold or unengaged subscribers too early
- ❌ Ignoring spam complaints
- ❌ Using spammy subject lines like “Buy now!!!” during warm-up
🔥 Pro Tips for a Faster Klaviyo Sending Domain Warmup
- Use plain-text emails or light design to look more human
- Avoid large image-to-text ratios
- Add “reply-to” addresses and encourage replies
- Keep your from name and domain consistent
📈 The Payoff of a Proper Klaviyo Sending Domain Warmup
After 2–3 weeks of warming up, your sending domain will be:
- Trusted by inbox providers
- Delivering to the inbox, not spam
- Ready for scaling your ecommerce revenue
🧪 Summary: Klaviyo Sending Domain Warmup
- ✅ Set up a verified domain in Klaviyo
- ✅ Start with highly engaged subscribers
- ✅ Gradually increase volume over 2–3 weeks
- ✅ Monitor deliverability KPIs daily
- ✅ Avoid cold lists and spammy content
