Email list health checker
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Email list health checker

A dirty list burns your sender reputation before your first campaign lands. Paste or upload your list to catch invalid, disposable, role-based and duplicate addresses. Everything runs in your browser: your list is never uploaded anywhere.

Your file is parsed locally with JavaScript. No address leaves this page.

Runs 100% in your browserNothing is uploaded or storedCleaned CSV downloadUp to 50,000 addresses

Why list hygiene decides deliverability

Bounces are a reputation signal, not just waste. Mailbox providers read your hard bounce rate as evidence of how you collected the list. Sustained bounces above about 2 percent get entire campaigns filtered, including the mail to your good subscribers.

Old lists rot on their own. People change jobs and abandon inboxes: a list untouched for a year can lose a fifth of its deliverable addresses without anyone unsubscribing. Migrated lists from a previous platform or store are where the worst surprises live.

Role addresses and disposables never convert. info@ and support@ reach ticket queues, not people. Disposable domains existed for ten minutes to grab a coupon. Both add cost and complaints while adding zero revenue.

Clean before you migrate, not after. Importing a dirty list into a new platform starts your new sending reputation with a bounce spike. Run this check first, import the cleaned file, and warm up with your engaged segment.

Keep it clean automatically

Brevo tracks bounces, complaints and engagement on every send, suppresses hard bounces for you, and unlimited contacts means you never pay to store the subscribers you are resting.

  • Automatic hard bounce and complaint suppression
  • Engagement-based segments for sunset flows
  • Unlimited contacts, pay only for what you send
  • Free plan with 300 emails a day, no card required
Create your free accountExplore contact management
500k+businesses send with Brevo worldwide
300free emails a day on the free plan
All-in-oneemail, SMS, WhatsApp, push and automation
EUhosted and GDPR compliant by design

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Frequently asked questions

Is my list uploaded anywhere?
No. The checker runs entirely in your browser with JavaScript. Addresses are parsed, checked and cleaned locally, and the optional DNS check only sends domain names (never addresses) to public DNS resolvers.
What bounce rate is safe?
Keep hard bounces under 2 percent per campaign. Above that, mailbox providers start filtering you; above 5 percent most platforms will pause your sending.
What is a disposable email address?
A throwaway inbox from services like mailinator or 10minutemail, usually created to grab a discount code. They never convert and inflate every cost that scales with list size.
Should I delete role-based addresses like info@?
Do not send marketing to them by default. They reach shared inboxes, convert poorly and complain often. Keep them out of campaigns, or in a separate segment if a real person replied from one.
Does this replace paid email verification?
It replaces the diagnostic step. Paid verifiers additionally ping each mailbox over SMTP to confirm it exists, which cannot be done from a browser. Run this first; if your score is low, verify the survivors before a big send.