InboxValid
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SolutionsDeep Verification. One Outcome

The Intelligence Behind Every Valid Email

Every answer comes from the mail provider itself, and when it will not answer, we say unknown instead of guessing.

Results

Real Actionable Results. No Guesswork.

A verifier that never says “I don’t know” is guessing. Here is every verdict InboxValid returns and what each one means for your next send.

Validsara@acmecorp.com

The mailbox exists. The receiving provider confirmed the recipient, so this address can be mailed today.

Invalidbilling@oldstartup.io

The server rejected the recipient outright. Sending here is a guaranteed hard bounce, and hard bounces are what mailbox providers count against your reputation.

Catch-Allhello@agency-mail.net

The domain accepts everything, so acceptance proves nothing. We say so instead of scoring it valid, and give you a risk score to decide with.

Disposabletmp4821@mailinator.com

A throwaway inbox from a known temporary provider. It will stop existing shortly, so remove it from any long-term list or nurture sequence before you send.

Role Accountsupport@acmecorp.com

A shared functional mailbox rather than a person. Deliverable, but it draws complaints in cold outreach, so it is flagged separately from invalid.

Unknownj.chen@enterprise.co

The server gave no straight answer within the retry window. We return unknown rather than guessing, and you pay only if a later re-run resolves it.

Real-Time Mailbox Verification

Every address is checked against its mail provider: syntax, typo detection, MX records and mailbox existence, with native lookups for Google, Microsoft 365, Yahoo and iCloud. Results in seconds.

response
{
  "email": "sara@acmecorp.com",
  "status": "valid",
  "sub_status": "mailbox_exists",
  "provider": "google",
  "mx_host": "aspmx.l.google.com",
  "trust_score": 96
}
Real-Time SMTP

Verified Email Finder

Enter a name and company domain. We test the likely work-email patterns against the live mail server and returns the one that answers.

verified match
Sara Chen · acmecorp.com
  pattern     first.last
  candidate   sara.chen@acmecorp.com
  status      found and verified
Email Finder

Deliverability Audits

One click grades a domain across 8+ checks, including MX, SPF, DKIM, DMARC, PTR, blocklists, MTA-STS and BIMI, plus a Gmail/Yahoo/Microsoft bulk-sender verdict.

audit
acmecorp.com                    grade B+
  MX          pass    SPF       pass
  DKIM        pass    DMARC     p=none
  PTR         pass    blocklist clean
  MTA-STS     none    BIMI      none
Deliverability Audits

Bulk List Cleaning

Paste up to 50,000 addresses or upload CSV, TSV, TXT, Excel or JSON files of up to 10 million rows. Watch live progress, pause or cancel any time, and pay only for what reaches a verdict.

job progress
job_8f21c4   running   38,204 / 50,000
  valid        29,881
  invalid       5,402
  catch-all     2,117
  unknown         804
Bulk List Cleaning

Catch-All & Risk Detection

Spot catch-all domains, role accounts and risky addresses with a per-email risk score, so you decide what makes the cut.

flags
hello@agency-mail.net   catch-all   risk 58
support@acmecorp.com    role        risk 41
sara@acmecorp.com       clean       risk 4
Catch-All & Risk

Disposable Email Filtering

Temporary and throwaway inboxes are flagged automatically before they ever pollute your list or skew your metrics.

signup guard
if (result.is_disposable) {
  return reject("Use a permanent address");
}
Disposable Filtering

Developer-First API

Verify at signup, in your CRM or anywhere else with simple API keys, a REST API with rich structured results, and live job progress over SSE.

request
curl https://api.inboxvalid.com/v1/verify \
  -H "Authorization: Bearer $IV_KEY" \
  -d '{"email":"sara@acmecorp.com"}'
Developer API

See It Run on Your Own List

Every account starts with free credits; eligible business emails can apply for 100,000.

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