Pricing

Pay per usage

Email Verification Tool

Verify email addresses in bulk by checking DNS MX records, SMTP server responses, and mailbox existence. Returns deliverability score, catch-all detection, and disposable email flagging.

Pricing

Pay per usage

Rating

0.0

(0)

Developer

Ahmed Moussa

Actor stats

Bookmarked

Total users

Monthly active users

20 days ago

Last modified

Email Verifier (syntax + MX + SMTP — no paid API)

A cost-safe email verifier that uses only free / deterministic checks. It never calls a paid email-verification API and it never sends email.

What it checks

Check	How	Cost
Syntax	Pragmatic RFC-5322 validation	free (pure code)
MX	DNS MX lookup (A/AAAA fallback per RFC 5321)	free DNS query
SMTP	Best-effort `RCPT TO` probe against the MX (no `DATA` sent)	free TCP to MX:25
Disposable	Bundled list of throwaway providers	free (pure code)
Catch-all	Probe a random mailbox; if accepted, domain is catch-all	free SMTP probe

Honest limitations

SMTP probing is best-effort. Many mail servers block inbound port 25 from cloud hosts, greylist, or accept all recipients (catch-all). In those cases the result is reported honestly as smtp_check: "unknown" — it is never upgraded to a false "valid". A domain with no MX/A records returns mx_found: false and is treated as not deliverable.

Input

{ "email": "postmaster@gmail.com" }

or a batch:

{ "emails": ["a@gmail.com", "b@example.com"], "smtp_check": true }

email — a single address.
emails — optional batch list (processed in addition to email).
smtp_check — run the SMTP probe (default true); set false for syntax+MX only.

Output (one dataset item per address)

{
  "email": "user@example.com",
  "syntax_valid": true,
  "domain": "example.com",
  "mx_found": true,
  "mx_records": ["mx1.example.com"],
  "smtp_check": "unknown",
  "disposable": false,
  "catch_all": null,
  "score": 0.4,
  "reason": "MX present; SMTP port 25 unreachable/blocked — deliverability inconclusive"
}

score is a deterministic 0.0-1.0 confidence: 0 for invalid syntax / no MX, ~0.4 when MX exists but SMTP is inconclusive, up to ~0.95 when SMTP positively accepts a non-catch-all mailbox.

Cost safety

$0 idle, bounded $0-network per run: DNS + SMTP are free, every call has a hard timeout, and SMTP only ever connects to the domain's resolved MX hosts on port 25 (no arbitrary-URL fetch).
No paid API keys, no third-party verification service, no email sent.

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