Klaviyo High Bounce Rate: How to Clean Your List in Klaviyo
Your Klaviyo bounce rate is above 2-3%
Address within 24-48 hours.
Assess your bounce rate in Klaviyo:
In Klaviyo Analytics > Campaign Performance, check bounce rate for recent sends
Calculate: bounced / total delivered
When did bounce rate spike? After importing a list?
Check Profiles > Suppressions to see hard bounce list
What Could Be Causing This?
Klaviyo List Import with Invalid Addresses
Most CommonImporting a purchased or old list to Klaviyo without validation causes high hard bounces.
How to confirm:
In Klaviyo, check the "Import History" — when did you import the list that caused the bounce spike?
Unvalidated Email Addresses in Klaviyo Signup Form
CommonIf Klaviyo signup form doesn't validate emails, typos enter the list.
How to confirm:
Review hard bounces in Klaviyo Suppressions — do you see typos (missing TLD, double @, etc.)?
Fix Playbook
Step 1: Use Klaviyo List Validation (If Available)
- Klaviyo offers built-in list validation via Klaviyo integrations (third-party)
- Or use external validators like ZeroBounce or BriteVerify
- Upload list to validator, download cleaned list, re-import to Klaviyo
- This removes invalid addresses before import
Klaviyo-Specific Note:
Klaviyo has integrations with validators — check Integrations tab for available options.
Step 2: Remove Hard Bounces from Klaviyo
- In Klaviyo, go to Profiles > Suppressions
- Click "Hard Bounces" tab
- Klaviyo automatically suppresses hard bounces, but verify they're in suppression list
- These addresses won't receive future emails (best practice)
Klaviyo-Specific Note:
Klaviyo auto-suppresses hard bounces — this is automatic and good.
Step 3: Enable Email Validation on Klaviyo Signup Form
- In Klaviyo, edit your signup form
- Enable "Email Validation" on the email field
- This catches typos in real-time (helpful but not perfect)
- For better validation, consider double opt-in (confirmation email required)
Klaviyo-Specific Note:
Klaviyo forms have built-in validation — enable it to prevent bad signups.
Prevention Checklist
- Always validate lists before importing to Klaviyo
- Enable email validation on Klaviyo signup forms
- Monitor bounce rate weekly in Klaviyo Analytics
- Review hard bounce list monthly
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