Inbox Placement Now Live

Never Let Your Emails Bounce Again

Validate emails, monitor blacklists, and see exactly where your messages land — inbox, spam, promotions, or updates. All in one platform.

Start Free See Features
100 free validations / mo No credit card REST API
app.bounceblocker.io/validate
hello@example.com
Validate
Validating

hello@example.com

  • Checking email syntax
  • Looking up mail server (MX)
  • Probing SMTP handshake
  • Checking disposable providers
  • Detecting catch-all domain
99.9%
Validation accuracy
100+
Blacklists monitored
5
Mailbox providers
<500ms
Average API response
Email Validation

Real verification — not just syntax checks

Most validators stop at MX. We probe the real mailbox via SMTP, detect catch-all domains, flag disposable providers, and even spot spam traps before they damage your sender reputation.

  • Syntax + DNS + MX + SMTP probe — every check, every email
  • Catch-all & disposable detection out of the box
  • Spam-trap heuristics protect your sender reputation
  • Helpful "did you mean?" suggestions for typos
Try the validator
app.bounceblocker.io/validate
Validating

hello@example.com

  • Checking email syntax
  • Looking up mail server (MX)
  • Probing SMTP handshake
  • Checking disposable providers
  • Detecting catch-all domain
app.bounceblocker.io/bulk
Validating your list

customer-list.csv

Your List4,823 emails
Validatoranalyzing…
Processed62%
Total
4,823
Valid
2,914
Invalid
319
Duplicates
147
Bulk Validation

Clean an entire list — without paying twice

Upload a CSV with thousands of addresses. We deduplicate first, validate each unique address once, and copy the result to every duplicate row — so your quota goes further.

  • Smart duplicate detection — never billed twice for the same email
  • Per-row report with full status, sub-status, and notes
  • Filter by Valid / Invalid / Duplicate · search by domain
  • Download a clean CSV when you’re done
See bulk report
Domain Health

SPF, DKIM, DMARC — verified in seconds

A complete domain audit that scans your authentication records, scores your deliverability posture, and checks 8+ blacklists in parallel. No more guessing why mail goes to spam.

  • SPF / DKIM / DMARC parsed and validated against best practice
  • 8+ blacklists checked simultaneously
  • Overall health score 0–100 with actionable issues
  • Full check history — track improvements over time
Audit your domain
app.bounceblocker.io/domain-health
Running full health check

bounceblocker.io

  • Resolving DNS records...
  • Checking SPF authentication
  • Verifying DKIM signature
  • Inspecting DMARC policy
  • Scanning 8 blacklist providers

Everything else, included

Built for deliverability, end to end

From single-email validation to inbox placement testing — protect your sender reputation and reach the inbox, every time.

Real-time REST API

Validate emails in your signup flow with sub-second response times.

Spam-trap detection

Catch trap addresses before they damage your sender reputation.

Spam score analyzer

Score email content against 30+ spam heuristics before you send.

Analytics dashboard

Track validation trends, monitor API usage, and audit list quality.

Developer-first

Simple JSON API, generous rate limits, and per-key usage tracking.

Privacy-preserving

Your data is never sold. Encrypted at rest. EU-friendly defaults.

How it works

Three steps from list to inbox

1

Submit emails

Validate one address via API, or upload a CSV of millions for bulk processing.

2

We verify deeply

Syntax · MX · SMTP probe · disposable · catch-all · spam-trap — in parallel, in seconds.

3

Send with confidence

Get a clean list with per-address verdicts. Skip duplicates. Protect your sender reputation.

Pricing

Simple, transparent pricing

Start free, scale as you grow. Cancel anytime.

Free

For trying it out

$0 /month
  • 100/mo validations
  • No inbox tests
  • No blacklist monitors
  • Domain health checks
  • Spam score analysis
  • REST API access
Get Started
Most Popular

Starter

For growing senders

$49 /month
  • 5,000/mo validations
  • 10 inbox placement tests
  • 10 IPs/domains monitored
  • Domain health checks
  • Blacklist monitoring
  • Spam score analysis
  • REST API access
Start Trial

Pro

For high-volume teams

$250 /month
  • 50,000/mo validations
  • 2,500 inbox tests
  • 50 IPs/domains monitored
  • Domain health checks
  • Blacklist monitoring
  • Spam score analysis
  • Priority email support
  • REST API access
Start Trial

Enterprise

For platforms & ESPs

$599 /month
  • 500,000/mo validations
  • 500 inbox tests
  • Unlimited IPs/domains
  • Domain health checks
  • Blacklist monitoring
  • Spam score analysis
  • Dedicated support
  • SLA + uptime guarantee
  • REST API access
Contact Sales

All plans include REST API access · No setup fees · GDPR-friendly

FAQ

Questions, answered

How is BounceBlocker different from a free email checker?
Free checkers usually only run a syntax + MX check. We go further with a real SMTP probe, catch-all detection, disposable-domain matching, spam-trap heuristics, and inbox-placement testing against real seed mailboxes — giving you a verdict you can trust.
Will validating addresses hurt my sender reputation?
No. Our SMTP probes are sent from warmed-up IPs with proper rDNS, SPF, and DKIM, and we throttle per receiving server. Your sending IPs are never used for validation.
How accurate is the validation?
We aim for 99.9% accuracy on deliverable / undeliverable verdicts. Some providers (Yahoo, AOL, mail.com, ProtonMail) deliberately limit SMTP responses — for those we return a transparent "unknown" instead of guessing.
Do you charge for duplicates in bulk uploads?
No. We deduplicate before validation and only charge for unique addresses. The detailed bulk report shows you which rows were duplicates and which unique address they pointed to.
Can I cancel anytime?
Yes — every paid plan is monthly and cancels in one click from your billing page. Unused validations do not roll over.
Do you offer an API?
Every plan includes our REST API. Authenticate with a per-key token; revoke any time.
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Ready to protect your inbox?

Join teams who trust BounceBlocker to keep their email lists clean and their messages out of spam.

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100 free validations / month · No credit card required