Does Qualisend have a native Klaviyo integration?

A native one-click connector is being rebuilt as part of our platform upgrade and will return. Today the supported path is the CSV loop - export from Klaviyo, verify in Qualisend, suppress the dead addresses - or verifying at signup through the API. Both work with any Klaviyo plan.

Will cleaning my list lower my Klaviyo bill?

It can. Klaviyo prices on active profiles, and suppressed profiles aren't active - so suppressing the undeliverable and disposable addresses you'll never reach again can move you down a tier. Verifying before you import a list keeps the junk out of your active-profile count from the start.

Should I suppress or delete cleaned profiles?

Suppress. Suppression stops every send and removes profiles from your active count while keeping their history, and a manual suppression is reversible if you got one wrong. Deletion (under Settings → Other → Profile maintenance) is permanent and can't be recovered, so Klaviyo's own guidance is to suppress unless you have a specific reason to erase.

How many addresses can I verify at once?

Bulk cleaning handles up to 1,000,000 addresses per job with live progress, and duplicates are charged once. The free plan includes 100 one-time credits that never expire - enough for a first sample.

Can I verify addresses before they enter Klaviyo?

Yes - it's the highest-leverage option. Verify at signup through the REST API (or a Zapier/Make/n8n flow) so typos and disposable addresses never become profiles in the first place, which beats cleaning them out after they've counted against your bill.

Native one-click sync: live

Keep your Klaviyo profiles clean and deliverable

Klaviyo automatically suppresses addresses that hard-bounce, but it can't judge a profile it has never sent to - and those never-mailed invalids are what quietly erode your deliverability and pad your active-profile count. Qualisend closes that gap: export your list or segment, verify every address, and suppress the dead ones so junk never reaches a send. Here's the workflow that works today, plus the API and no-code options.

Clean a list for free Read the Klaviyo guide

Native connector

Connect Klaviyo and clean it in place

Connect Klaviyo with an API key and Qualisend verifies the lists you already have - right inside Klaviyo, no export. Dead and risky addresses are suppressed or archived for you, every new subscriber is checked in real time, and you can re-verify on a schedule so the list never drifts back to dirty.

Prefer to work by hand, or verify at signup through your own stack? The CSV export → verify → reimport loop below and the REST API are fully supported too.

Connect Klaviyo

Klaviyo handles

What Klaviyo cleans for you

Klaviyo's native suppression handling is genuinely solid: an address that hard-bounces is suppressed automatically, one that soft-bounces more than 7 consecutive times (counted over the past two years) gets suppressed too, and unsubscribes and spam complaints become suppressed profiles that are excluded from every send. Suppressed profiles also stop counting toward the active-profile total Klaviyo bills on, so its own hygiene never inflates your invoice. For addresses Klaviyo has actually mailed, that's reliable automatic hygiene.

The gap it leaves

What it can't catch

The catch is that every one of those mechanisms is reactive - it needs a send, a bounce, or a complaint to fire. Never-mailed invalids from imports and signup forms, disposable inboxes that expired after grabbing a discount code, role addresses, and decayed mailboxes all look identical to a healthy profile in Klaviyo until your first campaign hits them - which is exactly when a mailbox provider forms its first impression of your domain. An imported list is the sharpest case: it arrives with its bounce history amputated, so addresses that were already failing on the old ESP come in looking brand new, and Klaviyo will happily mail all of them once.

Why a clean Klaviyo list matters

On Klaviyo the stakes are double, because Klaviyo prices on active profiles. Every dead address is a line item on your invoice as well as a drag on deliverability - undeliverable and disposable profiles push you toward the next pricing tier while pulling down the engagement rates that Klaviyo's own reputation model, and Gmail and Yahoo's 2024 sender rules, judge you on. Cleaning before a send does two jobs at once: suppressing the addresses you were never going to reach again can move you back under a pricing threshold, and it protects the inbox placement of the flows and campaigns that actually convert. The right order is verify first, import second - never mail an unverified list to find out.

Prefer CSV or the API? Here's the manual path

The native connector is the fastest route, but the CSV loop works on any Klaviyo plan: export from Klaviyo, verify in Qualisend, and act on the results.

Export your list from Klaviyo

Open the list or segment, choose Manage list → Export list to CSV, and download the file. Export the full list for a first clean; for maintenance, an "engaged never" or "created before" segment targets just the profiles most likely to have decayed.

Verify the file in Qualisend

Upload the CSV to Qualisend bulk cleaning - up to 1,000,000 addresses per job, duplicates charged once - or paste addresses directly. The free plan's 100 credits (they never expire) cover a first sample end to end.

Read the results

Every address returns deliverable, risky, undeliverable, or unknown with a reason code and sub-flags (catch-all, disposable, role, full mailbox), plus the domain's MX provider and probe detail as evidence. Download the cleaned CSV with the verdict columns included.

Suppress the undeliverables in Klaviyo

Filter the results to undeliverable, keep a single column with the header Email, then go to Profiles → View suppressed profiles → Import and upload it. Klaviyo recommends suppressing over deleting: suppression removes profiles from every send and from your active count, and unlike deletion it's reversible if you made a mistake.

Or automate it at signup

Prefer to keep junk out from the start? Verify at the point of capture with the Qualisend REST API (scoped keys, rate limits, webhooks), or wire a no-code flow through Zapier, Make, or n8n so new Klaviyo profiles are checked before they're ever created - which stops typos and disposables from entering your active-profile count in the first place.

What Qualisend flags on every address

Never-mailed invalid addresses that would hard-bounce on your next campaign
Disposable / throwaway domains built to expire after the discount code is claimed
Role addresses (info@, billing@) that skew engagement-judged flows
Catch-all domains, flagged so you can segment and throttle them
A 0-100 confidence score and machine-readable reason code for every address

Native connector status

The native Klaviyo connector is live - connect it in Qualisend under Integrations and clean your list without a single CSV. New contacts are verified automatically, and you can re-verify on a schedule.

What to do with each result

Every address comes back with a verdict and sub-flags. Here's the action that keeps your Klaviyo list clean without throwing away contacts you can still reach.

deliverableKeep sending as normal.

deliverable + role flagKeep for transactional and newsletter content; exclude from engagement-judged flows - a shared inbox skews your metrics.

risky + catch-all flagMove to a dedicated segment and throttle your sends.

risky + disposable flagSuppress - the inbox was built to expire.

unknownLeave active and re-verify next clean - usually greylisting, not a verdict on the mailbox.

undeliverableSuppress via the CSV import; don't wait for the bounce to prove it.

Klaviyo verification FAQ

Clean your Klaviyo list in minutes

Start free with 100 credits that never expire - no card required. Connect, verify, and protect your next campaign.

Clean a list for free All integrations