Built for

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Scrub your list for bad emails on autopilot.
Reduce costs and maximize deliverability by clearing out bounces, undeliverables, and spam signups, while correcting typos and more.
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Protect domain reputation
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Lower ESP cost
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Improve deliverability

HOW IT WORKS

Zero effort
Verify all new emails the moment they enter your list.
Keep your list healthy and high-performing without the manual work. Our guided onboarding gets you up and running quickly.
Sign Up
Create your account in seconds and get started instantly.
01
Connect Klaviyo
Securely link your email platform. Follow the short onboarding steps.
02
Select a Segment
Choose the segment you want us to track for new emails or have all email addresses checked.
03
Reap the Benefits 🎉
Enjoy better deliverability, healthier lists, and lower costs.
04
Catch risky email addresses before they impact your sender reputation
Harmful email addresses are found and suppressed before they wreak havoc meaning your brand will stay out of the spam folder.
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No
guesswork
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No black
box models
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No assumptions
on engagement
Why List Hygiene?
We catch and fix more.
Go beyond basic email verification with one of the most comprehensive sets of checks available. Risky profiles are suppressed, typos are corrected, and the right action is taken automatically so your list stays clean without extra work.
Learn More about Status Codes

DO NOT MAIL

Bot emails
Created and used at scale by malicious actors. They fake engagement and are built to handle double opt-ins and captchas beating engagement-based segmentation efforts.

DO NOT MAIL

Spam traps
Abandoned email addresses used by inbox providers to detect poor list hygiene. Unfixed, it directly impacts sender reputation and leads to blacklisting.

DO NOT MAIL

Toxic domain

Emails tied to domains known for spam or fraudulent activity.

DO NOT MAIL

High-frequency spam reporters

Sometimes referred to as abuse prone emails, these emails are tied to high-frequency spam complaints often with malicious intent.

DO NOT MAIL

Mailbox does not exist

Addresses pointing to nonexistent mailbox.

DO NOT MAIL

Hard bounce risk

Addresses that have returned a permanent delivery failures, preventing email delivery.

DO NOT MAIL

"Do not mail" status

Email addresses flagged as restricted for sending email to.

DO NOT MAIL

Catch-all emails

Catches emails sent to a domain where a mailbox does not exist.

DO NOT MAIL

No MX records

Domains without valid mail server configurations.

DO NOT MAIL

Unroutable IP

IPs unable to deliver messages to the recipient's server.

DO NOT MAIL (BEST PRACTICE)

Temporary or disposable email

Single-use addresses, often for discounts or bypassing account creation restrictions. Ineffective for long-term marketing.

UPDATED OR MERGED

Typos e.g. “gmial”
When the domain of an email is mistyped by the user.

LONG-TERM RETRIES

DO NOT MAIL (BEST PRACTICE)

Full mailboxes
Email addresses unable to receive messages due to storage limits. Retried monthly to preserve CAC before ultimately suppressing.

SMART RETRIES

DO NOT MAIL

Temporary error
A mailbox provider was temporarily down and mail delivery was unsuccessful. Retried using a smart backoff interval to preserve CAC before ultimately suppressing.
Ditch the CSV for a fully automated Klaviyo integration
That's right. No more unsecure, massive, and manual CSV handling. No monthly checklist to run. List Hygiene runs in the background without disrupting marketing efforts. Invalid email profiles are suppressed, not deleted, to save money and data.
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The Hidden Problem in Your Email List
Most brands don’t realize how quickly their list quality can decline.
Overtime, email list accumulate invalid addresses
It sabotages marketing efforts.
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Up to 1 in 3 emails are invalid.  
Reviewing last year's data, we saw an average invalid rate of 11% with some lists being as high as 30%. Even good email addresses degrade over time, hurting marketing performance and creating excess cost.
Marketing lists
Tailor the approach to meet the needs of your brand.
A fully automated solution for maintaining clean, high-performing Klaviyo lists without the manual effort.
Ongoing cleanup
Each new signup is checked in real time, not after months.
New emails are automatically monitored and cleaned as they’re added, keeping your list accurate and up to date.
Historical cleanup
Clean your full list and keep it clean going forward.
Give your list a strong foundation while reducing costs before launching new campaigns or migrating to Klaviyo.
Retry logic
Acquisition is expensive. Temporary or one-time errors are rechecked so you don't lose good customers.
Retry full or temporarily unavailable mailboxes, helping preserve CAC by not discarding valuable leads too quickly.
Typo handling
Fix typos and merge duplicate profile activity.
Auto-correcting email typos can ensure your marketing efforts don't go to waste. This also means higher revenue for email. List Hygiene even consolidates duplicate customer history if necessary.
Data security you can trust
Your data is yours. It’s never sold, licensed, or used for purposes unrelated to core functionality. Valid emails are deleted shortly after processing to ensure privacy.
Note: Invalid emails are retained for reporting & future detection.
Simple scalable pricing
Pricing starts at $30 per month and is based on usage.
One credit is equal to an email address checked, a typo fix, or a retry.
Monthly volume
Price per credit
Price
1,000
$0.03000
$30
2,000
$0.02500
$50
4,000
$0.02250
$90
10,000
$0.01800
$180
17,000
$0.01765
$300
25,000
$0.01700
$425
50,000
$0.01650
$825
100,000
$0.01200
$1,200
150,000
$0.01100
$1,650
250,000
$0.01000
$2,500
500,000
$0.00950
$4,750
1,000,000
$0.00750
$7,500
Over 1,000,000
Contact Us
Contact Us
Get Started

Zero risk. No commitments. Cancel anytime.

Simple Scalable Pricing
Pricing starts at $60 per month and is based on usage.
One credit is equal to an email address checked, a typo fix, or a retry.
Get Started
Monthly volume
Price
1 to 2,999
$60
per month
3,000+
$0.0200
per credit
10,000+
$0.0175
per credit
25,000+
$0.0170
per credit
50,000+
$0.0165
per credit
100,000+
$0.0110
per credit
250,000+
$0.0100
per credit
500,000+
$0.0095
per credit
Over 1,000,000
Contact Us
Frequently asked questions
Doesn't my email platform provide this?
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No, it’s counter-productive to the billing model of most ESPs as they charge based on list size or send volume (which increases with list size).
Couldn't I segment by engagement?
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No, bots are designed to fake engagement, handle double opt-ins and bypass captcha checks, which we’ve confirmed through extensive testing. In some cases, invalid emails show higher engagement rates than valid inboxes.

Even profiles of engaged real users degrade over time as emails become invalid.
What’s included in bulk cleanup?
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The initial bulk email validation involves thoroughly analyzing your existing email lists to identify and remove invalid, risky, or inactive email addresses. This process sets a strong foundation by ensuring your campaigns are sent to active and valid subscribers only.
Will this tool integrate seamlessly with my current Klaviyo setup?
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Yes, the tool integrates seamlessly with your Klaviyo workflows. Once the initial setup is complete, the ongoing hygiene process will run smoothly in the background without disrupting your email campaigns.
How is the pricing determined for my email list?
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Pricing starts at $30 per month and is tiered based on the volume of emails scanned each month. Refer to the pricing table for detailed rates based on your email opt-in volume. One-time bulk cleanup is also possible and priced based on list size. If you have multiple Klaviyo accounts, volume pricing is calculated based on all accounts.
Do you handle email verification for email marketing agencies?
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Yes, we work well with email marketing agencies looking to improve the value they provide clients without increasing time spent managing the work. Pay for clients to unlock volume pricing or have each sign up on their own. Reach out to set up a partnerships, referrals, or affiliate setup.

We offer white label options for agencies managing email opt-in volume in excess of 10 million records per month. White labelling bulk one-time cleanup is available for lists over 500,000.
Why is list hygiene important for my marketing program?
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List hygiene improves deliverability, reduces bounce, and helps protect your sender reputation. By focusing on active and valid subscribers, you’ll see higher engagement rates and better campaign performance, ultimately leading to a more cost-effective marketing strategy.
If you suppress a profile in Klaviyo, will it also unsubscribe them from SMS messages?
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No. Suppressing a profile in Klaviyo only affects their email subscription status — they will no longer receive marketing emails. Email and SMS channels are managed independently within Klaviyo.
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