StopBouncingBuilt for people who care about inbox placement
StopBouncing is an email verification platform built to give marketers, developers, and agencies a reliable, transparent way to clean their lists before they send. We started from a simple premise: bounced emails are expensive, and most tools that claim to prevent them aren't honest about what they can and can't determine.
Our mission
Honest verification results — even when that means saying “we don't know”
The email verification space has a pervasive accuracy problem: services inflate their accuracy numbers by marking catch-all domains as “valid” — which technically isn't wrong, but practically misleads the sender into keeping addresses that may bounce.
StopBouncing treats catch-all addresses as “unknown” — which is the honest answer. Our accuracy numbers on clearly valid and clearly invalid addresses are above 98%, and we're not going to inflate that by guessing on ambiguous cases.
We charge only for what we verify, never lock you into a subscription, and store your data in Europe under GDPR. Those aren't selling points — they're the minimum standard we hold ourselves to.
What we check
Six checks. One honest result.
Every address goes through a full verification pipeline. We don't stop at DNS — we simulate delivery at the SMTP level.
Syntax validation
Format check before anything else — no wasted API calls on malformed addresses.
DNS / MX lookup
Confirms the domain has properly configured mail exchange records.
SMTP mailbox check
Simulates delivery to the specific mailbox without sending a real message.
Disposable detection
Flags thousands of temporary inbox providers updated continuously.
Catch-all identification
Detects domains that accept all addresses — returned as 'unknown', never falsely marked valid.
Role account detection
Identifies shared inboxes (info@, support@) that have low personal engagement.
What we stand for
How we operate
Accuracy over speed
We return 'unknown' when we can't confirm — never a guess dressed up as a verdict. Honest results protect your sender reputation.
EU-hosted, GDPR-compliant
Data stays in Europe. We are fully GDPR-compliant and publish our data processing terms openly. No ifs, no buts.
Pay for what you use
No monthly subscriptions, no seat fees, no expiring credits. Buy verifications, use them when you need them.
Security by default
HTTPS everywhere, encrypted storage, strict access controls, and published responsible disclosure policy. Security is not an afterthought.
Who we serve
Built for anyone sending email at volume
Email marketers
Clean your list before every campaign. Reduce hard bounces, protect your sender score, and improve inbox placement across all major providers.
Developers & SaaS
Integrate real-time verification into signup flows via our REST API. Block fake accounts and disposable addresses before they enter your database.
Marketing agencies
Verify client lists at scale via bulk CSV upload. Export results with full status detail and hand clean, verified data back to your clients.
Get in touch
Questions about the product, a specific verification result, or a bulk pricing inquiry? We respond to every message.
Transparency
We publish all our legal and operational policies openly. No buried terms.
Try it yourself
100 free verifications on signup. No credit card. No subscription.