Klaviyo Email
Verification Integration
Klaviyo is one of the most powerful email and SMS marketing platforms for ecommerce brands — but sophisticated flows and segments mean nothing if you are sending to invalid addresses. Connect to Valid Email Checker and verify your lists directly, with no CSV exports or manual uploads.
Connect Klaviyo
Secure one-click authorization
Connection Name
No API keys needed. You are redirected to Klaviyo to approve access, then brought right back — connected.
What You Need to Get Started
Klaviyo Account
Any plan — free or paid.
One-Click Connect
Secure OAuth — no API keys to manage.
Verification Credits
1 credit per email verified.
Under a Minute
Click Connect, approve, done.
How to Connect Klaviyo
Connect securely with Klaviyo OAuth — no API keys to create or copy. Two clicks and your lists sync.
Open Valid Email Checker & Choose Klaviyo
In Valid Email Checker, go to Integrations in the sidebar (or Bulk Upload → Connect Email Platform) and click Klaviyo. Give the connection a friendly name — helpful if you manage multiple brands — then click Connect with Klaviyo.
No API keys.You never create, copy, or paste a key — Valid Email Checker connects through Klaviyo's official OAuth.
Approve Access on Klaviyo
You are taken to Klaviyo's secure authorization screen, which lists exactly what Valid Email Checker can do. Sign in if needed, review the permissions, and click Allow. You are brought straight back — connected — and your lists sync automatically within a few seconds.
Permissions we request (least-privilege):
You stay in control:revoke Valid Email Checker's access anytime from your Klaviyo account settings — no need to contact us.
Select a List and Configure
Your Klaviyo lists load straight away. Select the one you want to verify and we count its emailable profiles, then choose your mode: Verify Only to review results before making changes, or Clean Automatically to remove invalid and disposable emails from your Klaviyo list in real time. You control exactly what happens to each email type — unsubscribe, delete, or keep.
Tip:Start with "Verify Only" on your first run. Segments are dynamic — new subscribers matching the criteria get added automatically and will not be verified yet. Consider periodic re-verification for active segments.
Track Results in Real Time
Click Import Listand you will be redirected to the Uploads & Results page where you can watch progress in real time. No need to refresh — the page updates automatically. For large lists, feel free to close the browser; verification continues in the background. When complete, click View Results to see the full breakdown and download your verified data. If you chose automatic cleaning, changes are already applied to your Klaviyo profiles.
Want a visual walkthrough with screenshots?
Our help center has the full step-by-step guide with images for every screen.
Two Ways to Verify
Verify Only
Import and verify your list without touching anything in Klaviyo. Review the full results, export them, and decide what to do next — on your terms. We never modify your list.
Best for:
Clean Automatically Recommended
Verify and clean in one step. Bad addresses are unsubscribed or deleted directly from your Klaviyo list — and you still get the full results to view and export on Uploads & Results, exactly like Verify Only.
You control each email type:
Tracking Your Verification Progress
Once verification starts, you are automatically redirected to the Uploads & Results page where everything updates in real time — no refreshing needed.
What you will see for each task:
Task ID
Unique identifier for this verification
List Name
Your Klaviyo list name with integration icon
Upload Date
When verification started
Total Emails
Number of profiles being verified
Status
Processing, Completed, Failed, or Deleted
Progress
Real-time percentage with progress bar
Processing
Verification in progress
Completed
Click "View Results" to see breakdown
With Warning
Some emails could not be processed (credits refunded)
Failed
Something went wrong (rare)
Managing Your Klaviyo Connection
Connection Actions
Click the three-dot menu next to any connection on your Integrations page:
Sync Now
Refresh lists to get the latest subscribers, new lists, or updated segment counts.
Rename
Change the connection display name — helpful when managing multiple brands.
Delete
Remove this connection. Does not affect your Klaviyo account, lists, or profiles.
Multiple Accounts
Managing multiple brands or client accounts? Connect as many Klaviyo accounts as you need.
Go to Integrations (or Bulk Upload → Connect Email Platform) → Klaviyo
You will see your existing connections listed
Click "+ Add Another Account"
Give it a unique name (e.g., "Brand B — Klaviyo")
Click Connect with Klaviyo and authorize that account
Sign in to the correct brand's Klaviyo account when the authorization screen appears — each connection is authorized separately.
Credits & Billing
1 Credit = 1 Email
Same rate as all other verification methods.
Unknown = Refunded
Credits returned instantly for unverifiable emails.
Duplicates = Free
Removed before charging — you only pay for unique emails.
Balance Visible
Check credits in the top-right corner of your dashboard.
Credits Running Low?
If you do not have enough credits for your list size, you can purchase more credits instantly or set up auto-refill so you never run out during a critical verification.
Team Member Access
Team members can connect their own Klaviyo accounts and run verifications using the shared team credit balance. The account owner can see credits used by each team member in the transaction history.
Klaviyo Tips
OAuth Scopes Explained
Valid Email Checker connects with Klaviyo OAuth using the least-privilege scopes below — nothing more.
We never access your campaigns, flows, or templates — and you can revoke access anytime from your Klaviyo account.
Flows & Automations
Your Klaviyo flows are safe. Here is how verification interacts with your automations and workflows.
For Ecommerce Brands
Klaviyo is built for ecommerce — here is how to get the most out of list verification for your store.
Segments vs Lists
Both segments and lists appear in the selection screen, but they behave differently when it comes to verification.
Troubleshooting
Connection Didn't Complete
If you declined the authorization, or closed the Klaviyo tab before clicking Allow, the connection won't finish. Just click Klaviyo again, choose Connect with Klaviyo, and approve access on Klaviyo's screen to restart.
No Lists Appearing
Make sure you have at least one list in Klaviyo with subscribers. Click Sync Now to refresh. If lists still don't appear, disconnect and reconnect — re-authorizing re-syncs your lists.
Wrong Klaviyo Account Connected
The connection authorizes whichever Klaviyo account you were signed into on the authorization screen. If it's the wrong brand, delete the connection, sign into the correct Klaviyo account, and reconnect. Give each connection a clear name to keep multiple brands organized.
Verification Taking Too Long
Large lists naturally take longer. Lists under 1,000 take seconds; 10,000 emails take 5–10 minutes; 100,000+ emails may take 15–30 minutes. The progress bar updates in real time — no need to refresh. For very large lists, you can close the browser and check back later.
Changes Not Reflecting in Klaviyo
If you chose "Verify Only," changes do not sync back — that is the expected behavior. If you chose "Clean List Automatically," refresh your Klaviyo page or wait a few minutes for the interface to update. Check the profile status directly in Klaviyo to confirm changes.
Best Practices for Klaviyo List Hygiene
Before Your First Verification
Ongoing List Hygiene
Recommended Actions
Frequently Asked Questions
For active ecommerce stores, we recommend verifying your main newsletter list monthly, before every major campaign (Black Friday, product launches, seasonal sales), and quarterly for less active segments. Email data decays at roughly 2% per month, so regular verification prevents deliverability issues.
Not yet — the list picker currently shows your Klaviyo lists, and segment support is on our roadmap. In the meantime you can verify any list, and because Klaviyo segments are built from your profiles, cleaning the underlying list improves every segment that draws from it. If segment verification matters to you, tell us at support@validemailchecker.com — demand shapes what we build next.
No. Verification does not change your flow logic, triggers, or automations. It only affects individual profile statuses (subscribed → unsubscribed) if you choose "Clean List Automatically." Your welcome series, abandoned cart flows, and other automations continue running as normal.
Yes, but we recommend verifying one list at a time for better control. If you have one master list with everyone, you can verify that. For very large databases, verifying list by list gives you more granular control over cleaning actions.
Absolutely. We connect through Klaviyo's official OAuth — there are no API keys to manage, and you can revoke our access anytime from your Klaviyo account settings. We only read your lists and profiles to verify emails, and (if you enable cleaning) update contact status. We never send emails, access your campaigns, or modify your flows, and your contact data is deleted after 15 days.
Yes. Connect and authorize each Klaviyo account separately — just make sure you're signed into the right brand when Klaviyo's authorization screen appears. Give each connection a descriptive name (like "Brand A — Klaviyo" vs "Brand B — Klaviyo") so you can tell them apart.
If we cannot determine whether an email is valid or invalid — for example, if the mail server did not respond or timed out — the result is marked as "Unknown" and the credit is automatically returned to your account. You only pay for definitive results.
No. The integration works with any Klaviyo plan, including the free tier. Just click Connect with Klaviyo and approve access — no paid plan or API key required.
Ready to Clean Your Klaviyo Lists?
Sign up, connect your Klaviyo account, and verify your first list in under two minutes. 150 free credits included — no credit card required.
Get Started Free150 free credits · No credit card · Results in minutes