How to Remove Invalid Emails from Klaviyo (Step-by-Step)

1. Hard bounce: A hard bounce occurs when the email address is invalid or permanently unreachable. Klaviyo suppresses that profile immediately after the first hard bounce.

2. Soft bounce: A soft bounce is a temporary failure - full inbox, server downtime. Klaviyo only suppresses after 7 consecutive soft bounces.

Every send before suppression damages your domain. Gmail and Yahoo log those failures before Klaviyo acts.

Catch-all addresses create another gap klaviyo cannot close. Catch-all domains accept every incoming email at the server level. Even if the individual mailbox doesn't exist, no hard bounce fires. Klaviyo suppresses nothing.

Pre-send verification runs your list through an email validator before any campaign goes out. It catches syntax errors, dead domains, spam traps, and catch-all addresses.

Filter by suppression reason. Look specifically for deliverability suppressions, which include hard bounces and invalid address flags.

Export this list to CSV. These contacts are already out of your hands. Reviewing the volume shows how many invalid addresses got through before bouncing.

Klaviyo shows recipients skipped at send time, which is usually due to existing suppression. A rising skip count on a growing list signals accumulating invalid contacts.

Contacts who received 5+ emails in 180 days but never opened are high-risk. They show zero clicks, zero product views, and zero orders too. This often includes fake signups, typos, and role-based inboxes like info@ or noreply@. Flag this segment for verification before any send.

An unengaged subscriber has a real and active mailbox. They've just stopped opening. An invalid address will bounce. The fix for each is different.

Build a second segment:

Do not suppress this group yet. Some addresses here are perfectly valid. Run them through verification first to determine which are worth a re-engagement campaign.

Click the Manage List or Manage segment dropdown. Select Export List to CSV or Export Segment to CSV.

To export your full account, create an all-inclusive segment first. Set the condition to: can receive email marketing.

On the export screen, choose to export only the Email property. This cuts download time versus exporting every property.

Exports take a few minutes to process, depending on list size. Download the file from Settings > Other > Downloads. Exports stay available for 30 days.

Note: Only Owner, Admin, and Analyst roles can export lists or segments. If you don't see the export option, this permission is likely why.

Clearout is a pre-send email verification tool. It validates addresses for presence of MX records, SMTP mailbox, address syntax and more, with 20+ address validation checks per address. It also detects invalid, spam traps, disposable email and catch-all domains.

Clearout assigns each address a primary status and a Safe-to-Send flag. These two fields drive your suppression decisions.

These results tell you who's safe to email and who isn't. Clearout also backs some of these results with a deliverability guarantee.

On Clearout's Guaranteed Deliverability: It applies to addresses where Safe-to-Send = Yes. The email must be sent within 24 hours of verification. The list must be opt-in acquired.It does not include free services such as Yahoo or AOL, but some Microsoft 365 domains that are configured to block spam.

Verification does not need to be a one-time, manual process. You can now do it automatically for the future.

Klaviyo + Clearout: This integration is available via the Zapier app.

One example workflow: when a new profile is created in Klaviyo, Zapier triggers a Clearout verification on the email address. If the address returns as invalid, a follow-up Zap action suppresses the contact in Klaviyo before any campaign fires. Note that Zapier uses a polling trigger for Klaviyo, which checks for new profiles every 15 minutes on the free plan.

From Clearout results, filter for addresses meeting any of these conditions:

Export the filtered list. Open the file and delete every column except Email. The header must read exactly: Email.

Extra columns cause Klaviyo's suppression import to fail. You will not get an error message. The file simply will not process correctly.

For suppressing a CSV of invalid emails from Clearout verification results:

This bulk suppresses every invalid address from your Clearout results. Suppressed profiles stay in Klaviyo. They just can't receive marketing emails. They still count toward your billing. To reduce your active profile count and billing, delete them entirely from the suppressed profiles view.

Note: suppression applies only to email. It does not affect SMS or push notification status.

During import, Klaviyo asks whether to update subscription status for these contacts. Choose "No, import without updating subscription status." This keeps each contact's existing consent state unchanged.

Choosing the override instead re-marks every contact as subscribed. This includes anyone who previously unsubscribed. That creates both a compliance risk and a deliverability risk.

Your active list now contains only valid email addresses. Each one passed 20+ verification checks.

There's no fixed schedule. It depends on the list growth rate and send frequency. Here's a practical framework: