Stop bouncing. Verify every email before you send.

MailBounce checks email addresses in real time — catching invalid, disposable, role-based and risky addresses so your messages reach real inboxes. Real-time API, bulk list cleaning, and a free playground to try it instantly.

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MailBounce app showing a 98% inbox health score with delivered, bounce-rate and spam-risk metrics

Inbox health comparison: this month versus last month

Built for developers and teams who want clean lists without the guesswork — try every feature free, no credit card.

Bad email addresses quietly wreck your deliverability

Invalid, mistyped, and abandoned email addresses pile up in every list. Left unchecked, they drive up your bounce rate, and mailbox providers like Gmail and Outlook read a high bounce rate as a signal that you're a careless or risky sender — so fewer of your messages reach the inbox, even for the contacts you care about most.

Catch hard bounces early: live SMTP verification (RCPT TO) confirms whether a mailbox actually exists before you email it.

Stop typos at the source: did-you-mean suggestions recover signups lost to misspelled domains like gmial.com.

Filter the noise: flag disposable, role-based (info@, sales@), and free-provider addresses so you can segment with intent.

Protect your reputation: clean lists mean lower bounce rates, better inbox placement, and less wasted ESP quota.

How MailBounce works, end to end

Start in the free validation playground — paste an address and watch the full check run, no credits or card required. When you're ready to build, point your app at our clean JSON API: one call runs syntax, MX lookups over DNS-over-HTTPS, disposable and role-account detection, the free-provider flag, typo suggestions, and a live SMTP mailbox check, then returns a clear verdict you can act on at signup or checkout.

Bulk list validation

Already sitting on a list? Upload a CSV, TXT, or ZIP file, let it process in the background, and get results sorted into valid, invalid, catch-all, unknown, and disposable — ready to export back to CSV for your ESP or CRM.

Billing that respects your budget

You're only charged a credit for a definitive verdict. 'Unknown' results are free, so you never pay for answers we can't stand behind — and every account gets 100 free credits every month.

Everything you need to verify email, in one clean API

Real-time validation API

Validate a single address in milliseconds — syntax, MX, mailbox, disposable and role checks in one simple REST call.

Bulk list cleaning

Upload a CSV, TXT or ZIP and get a categorized, downloadable result: valid, invalid, catch-all, disposable and risky.

SMTP mailbox verification

We connect to the mail server to confirm the mailbox actually exists — not just that the domain can receive mail.

Disposable & role detection

Catch throwaway/temporary domains and role accounts like info@ and support@ that quietly hurt deliverability.

Protect your reputation

Lower your bounce rate, protect your sender reputation, and keep lists clean before every campaign.

Built for developers

Clean JSON responses, a bulk endpoint, credit-based billing and a free playground — integrate in minutes.

Answers before you commit a credit

MailBounce is built to be honest about what email verification can and can't do. The free playground lets you try every check without a card, and you only ever pay for a definitive verdict.

Here are the questions we hear most. If yours isn't covered, our FAQ goes deeper — or just email a real person.

Try the free playground

No. The validation playground lets you test the full set of checks for free, with no credits and no card. Sign up when you're ready to use the API or run a bulk list.

Only definitive verdicts use a credit, and we charge one credit per address each time you validate it. If a result comes back 'unknown,' it's free — you never pay for an answer we can't confidently give. Every account also gets 100 free credits each month, and the free playground never uses credits.

Beyond syntax and MX checks, we run a live SMTP verification (RCPT TO) that asks the receiving mail server whether the specific mailbox is deliverable, before you ever send to it.

Yes. Upload a CSV, TXT, or ZIP file for bulk validation. It processes in the background and returns results grouped into valid, invalid, catch-all, unknown, and disposable, with a CSV export ready for your tools.

Clean your lists before they cost you the inbox

Try every check free in the playground — no credit card, no credits spent. Wire up the JSON API or upload a list whenever you're ready.

Try the free playground Read the API docs