What is email deliverability in Klaviyo?

Email deliverability refers to whether your emails successfully land in your subscribers' inboxes rather than spam folders. In Klaviyo, deliverability is controlled by your sender reputation, authentication settings (SPF, DKIM), list quality, and engagement metrics. Klaviyo's Deliverability Hub provides a centralized dashboard to monitor and diagnose your email health.

How do I check my Klaviyo deliverability score?

Navigate to your Deliverability Hub in Klaviyo (Account > Deliverability). This dashboard shows your overall deliverability health, bounce rates, spam complaint rates, and inbox placement predictions. You can also use the benchmarking tool to compare your metrics against industry standards and best practices.

What are SPF and DKIM, and why do they matter for Klaviyo?

SPF (Sender Policy Framework) authorizes Klaviyo to send emails on behalf of your domain, while DKIM adds a cryptographic signature that verifies your email hasn't been tampered with. Both are required for proper email authentication and help prevent your emails from being flagged as spam. Set them up in Account > Settings > Authentication.

How do I improve my Klaviyo inbox placement?

Focus on three areas: authentication (SPF, DKIM, custom tracking domain), list hygiene (removing hard bounces and inactive subscribers), and engagement (sending to subscribers who open and click). Also maintain sender consistency, use Smart Sending to prevent frequency fatigue, and warm up your sending reputation gradually.

What is a good deliverability rate for DTC ecommerce?

A deliverability rate above 95% is considered healthy. Calculate yours by dividing successfully delivered messages by total recipients and multiplying by 100. If your bounce rate exceeds 2%, investigate your list quality and remove invalid addresses. Klaviyo's benchmarking tool can show how your rates compare to industry averages.

How often should I check my email deliverability metrics?

Check your core metrics (open rates, click rates, bounce rates) weekly during active sending periods. After launch day, review your Deliverability Hub within 24-48 hours to catch any issues early. Set up alerts for spike thresholds so you're notified immediately if something goes wrong.

What causes spam filters to block Klaviyo emails?

Common triggers include poor list quality (high bounce rates, spam complaints), inconsistent sender identity, missing authentication records, low engagement rates, and sending to unsegmented lists. Using a custom tracking domain, enabling Smart Sending, and maintaining sender consistency helps prevent spam filter issues.

12 Klaviyo Email Deliverability Checks Every DTC Founder Should Do Before Launch Day

12 Klaviyo Email Deliverability Checks Every DTC Founder Should Do Before Launch Day | Loyal Send

TL;DR

Your emails can't convert if they never reach the inbox, deliverability is the foundation of your Klaviyo revenue
Most founders skip technical setup and wonder why open rates tank after their first big send
Run these 12 checks in under 2 hours and your campaigns will hit inboxes from day one
Klaviyo's Deliverability Hub gives you all the tools, you just need to know where to look
Sender reputation damage is slow to fix but fast to prevent, do this before you send

1. Verify Your SPF and DKIM Authentication Records

Authentication is your first line of defense for Klaviyo email deliverability. Without SPF and DKIM records in place, mail servers treat your messages like spam, because they have no proof you actually sent them. With Klaviyo powering roughly 176,000 brands worldwide, the platform makes this straightforward: navigate to Account > Settings > Authentication to configure SPF (which authorizes Klaviyo to send on your behalf) and DKIM (cryptographic proof that your emails are legitimate). Both records must fully propagate before launch, which typically takes 24 to 72 hours. Use MXToolbox or Klaviyo's built-in validator to confirm everything is live before you send a single campaign.

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2. Complete Klaviyo's Deliverability Certificate

Before you send a single campaign, complete Klaviyo's free Deliverability Certificate, it's the fastest way to understand how Klaviyo email deliverability actually works. This self-paced course covers SPF and DKIM authentication, sender reputation, list hygiene, and campaign best practices. Think of it as a crash course in inbox placement. The bonus: completing it signals to Klaviyo's systems that you're a serious sender, which can improve your default sending reputation from day one. Find it in the Help Center under "Deliverability certification course."

3. Set Up and Navigate the Deliverability Hub

Check the Deliverability Hub first, it's your centralized dashboard for monitoring Klaviyo email deliverability health at the account level. You'll see your overall deliverability score, bounce rates, spam complaint rates, and inbox placement predictions all in one place. Catch issues before they compound. A rising bounce rate early on is easier to fix than a tanked sender reputation weeks later. Check the hub weekly during your first 30 days of sending to establish a baseline. Klaviyo powers roughly 176,000 brands worldwide, so they've built this tool to surface the metrics that actually matter for inbox placement. Make it part of your weekly ops routine.

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4. Configure Smart Sending to Prevent Overlap Fatigue

Enable Smart Sending before your first campaign goes out. This setting prevents Klaviyo from sending multiple emails to the same contact within a short window, you control the timeframe based on your cadence. Without it, subscribers caught in overlapping flows or campaigns get buried in back-to-back messages, triggering spam complaints that tank your sender reputation and damage your Klaviyo email deliverability. A tanked reputation means your emails land in spam folders instead of inboxes. Navigate to Account > Settings > Email > Smart Sending and set your frequency window. This single setting protects your deliverability without manual overlap segmentation every time you launch.

5. Audit Your Sender Identity and From Address Consistency

Mail servers track sender behavior across every touchpoint. If you send campaigns from "LoyaltyCo Official Store" and flows from "Team @ loyaltyco.com," you fragment your sender reputation and trigger spam filters. Pick one consistent from name, something simple like "Loyalty Co", and use it across every campaign and flow in Klaviyo. Your from email domain must also match your authenticated sending domain, or you'll trigger DMARC failures that tank your Klaviyo email deliverability. Inconsistency is one of the top reasons DTC brands see sudden inbox placement drops right after a successful launch. Lock in your sender identity now, not after you've damaged your reputation.

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6. Clean Your List Before Your First Major Send

Don't send a single promotional email until you've purged the dead weight. High bounce rates immediately tank your sender reputation, a list full of old, mistyped, or abandoned addresses is a deliverability death sentence. In Klaviyo, exclude subscribers with hard bounces, unsubscribes, and spam complaints from future sends using suppression lists. Run a re-engagement campaign for inactive subscribers before adding them to promotional campaigns. Your Klaviyo email deliverability score depends on sending to engaged, valid addresses, quality beats quantity every time.

7. Check Custom Tracking Domain Setup

Your welcome email contains links to "track.klaviyo.com", and that's a problem. Email clients recognize shared Klaviyo infrastructure, and when deliverability issues affect brands on that shared system, your emails can get caught in the crossfire. Use a custom tracking domain (e.g., emails.yourbrand.com) instead. This keeps your brand reputation entirely yours and prevents clients from treating your transactional emails like spam. Set it up in Account > Settings > Custom Tracking Domain and verify your DNS records propagate before launch. With so many brands sending through Klaviyo's default infrastructure, a custom domain is the fix.

8. Review Spam Complaint and Unsubscribe Rates

Spam complaint rates that exceed typical thresholds trigger ISP penalties that can get your domain blocklisted. Klaviyo suppresses complainants automatically from your list, but you still need visibility into these numbers. Check your campaign reports and the Deliverability Hub, if either metric spikes above your baseline, investigate your subject lines, content relevance, or send frequency immediately. Low engagement often precedes high complaints: subscribers who never open your emails are more likely to hit "spam" out of frustration. Set up alerts in Klaviyo for thresholds above your baseline so you catch problems within hours, not days. Staying ahead of complaint rates protects your sender reputation and ensures your emails actually land in inboxes.

12 Klaviyo Email Deliverability Checks Every DTC Founder Should Do Before Launch Day

Ready to put email campaigns to work?

8 Klaviyo Deliverability Levers DTC Brands at $50K+/Month Running Klaviyo Are Underusing in 2026

TL;DR

1. Verify Your SPF and DKIM Authentication Records

2. Complete Klaviyo's Deliverability Certificate

3. Set Up and Navigate the Deliverability Hub

Increase Your Email Revenue 20% in 90 Days

4. Configure Smart Sending to Prevent Overlap Fatigue

5. Audit Your Sender Identity and From Address Consistency

6. Clean Your List Before Your First Major Send

7. Check Custom Tracking Domain Setup

8. Review Spam Complaint and Unsubscribe Rates

9. Warm Up Your Sending Reputation Gradually

10. Run a Pre-Launch Seed List Test

11. Use the Benchmarking Tool to Compare Against Industry Standards

12. Monitor Open Rates, Click Rates, and Bounce Rates Weekly

Frequently Asked Questions