Catch bad email addresses before you send

Who it's for

Anyone who needs this answer fast, from a person to an AI agent.

Try it

Up to 10 addresses, one per line or comma separated.

Real sample output

Captured from a live call to this API (trimmed for length).

{
  "results": [
    {
      "input": "jane.doe@gmial.com",
      "email": "jane.doe@gmial.com",
      "verdict": "risky",
      "score": 1,
      "reasons": [
        "mail_server_from_a_record",
        "disposable_domain",
        "possible_typo_of:gmail.com",
        "no_spf",
        "no_dmarc",
        "domain_age_years:23"
      ],
      "summary": "jane.doe@gmial.com: risky (score 1) - Implicit (A record), disposable domain, did you mean jane.doe@gmail.com?, domain 23y old.",
      "localPart": "jane.doe",
      "domain": "gmial.com",
      "syntax": {
        "valid": true,
        "error": null
      },
      "domainExists": true,
      "mx": {
        "present": true,
        "hosts": [],
        "provider": "Implicit (A record)",
        "implicit": true,
        "nullMx": false
      },
      "flags": {
        "disposable": true,
        "role": false,
        "roleType": null,
        "freeProvider": false,
        "typoSuggestion": "gmail.com",
        "parkedDomain": false
      },
      "suggestion": "jane.doe@gmail.com",
      "domainHealth": {
        "spf": null,
        "dmarc": null,
        "createdAt": "2003-05-12T18:26:31Z",
        "ageDays": 8537,
        "registrar": "GoDaddy.com, LLC",
        "parkedEvidence": null
      },
      "catchAll": "not_checked",
      "mailbox": "not_checked",
      "errors": [],
      "ms": 748,
      "checkedAt": "2026-09-25T23:03:27.011Z"
    },
    {
      "input": "info@stripe.com",
      "email": "info@stripe.com",
      "verdict": "deliverable_likely",
      "score": 78,
      "reasons": [
        "mx_present",
        "role_account:general",
        "spf_present",
        "dmarc:reject",
        "domain_age_years:31"
      ],
      "summary": "info@stripe.com: deliverable_likely (score 78) - Google Workspace, role account (general), domain 31y old.",
      "localPart": "info",
      "domain": "stripe.com",
      "syntax": {
        "valid": true,
        "error": null
      },
      "domainExists": true,
      "mx": {
        "present": true,
        "hosts": [
          "aspmx.l.google.com",
          "alt1.aspmx.l.google.com",
          "alt2.aspmx.l.google.com",
          "aspmx2.googlemail.com",
          "aspmx3.googlemail.com"
        ],
        "provider": "Google Workspace",
        "implicit": false,
        "nullMx": false
      },
      "flags": {
        "disposable": false,
        "role": true,
        "roleType": "general",
        "freeProvider": false,
        "typoSuggestion": null,
        "parkedDomain": false
      },
      "suggestion": null,
      "domainHealth": {
        "spf": "softfail",
        "dmarc": "reject",
        "createdAt": "1995-09-12T04:00:00Z",
        "ageDays": 11336,
        "registrar": "SafeNames Ltd.",
        "parkedEvidence": null
      },
      "catchAll": "not_checked",
      "mailbox": "not_checked",
      "errors": [],
      "ms": 107,
      "checkedAt": "2026-09-25T23:03:26.370Z"
    }
  ],
  "count": 4,
  "verdicts": {
    "deliverable_likely": 1,
    "risky": 2,
    "undeliverable": 1,
    "invalid": 0
  },
  "checks": {
    "domainAge": true,
    "parkedWebsite": true,
    "mailbox": "never probed (no SMTP)"
  }
}

Limits, plainly

Free and rate limited so it stays fast for everyone. A bulk and scheduled version for big lists is coming to the Apify Store.

• 20 calls per minute per IP address.
• Up to 10 emails per call.
• Domain age and parked-site checks run in full for up to 5 different domains per call.
• Mailboxes are never probed (no SMTP), so the top score is 90.
• Free, no key.

Use the API

JSON over HTTPS, CORS enabled, no key. GET for quick calls, POST a JSON body for lists. Spec: openapi.json · llms.txt

curl -s "https://mailvett.cybermax-tools.workers.dev/api/validate?email=jane.doe%40gmial.com%0Ainfo%40stripe.com%0Atest%40mailinator.com%0Asales%40this-domain-does-not-exist-9x7q.com"

# lists: POST a JSON body
curl -s -X POST https://mailvett.cybermax-tools.workers.dev/api/validate \
  -H "content-type: application/json" \
  -d '{"emails":["jane.doe@gmial.com","info@stripe.com","test@mailinator.com"]}'

import requests

r = requests.post("https://mailvett.cybermax-tools.workers.dev/api/validate",
                  json={"emails":["jane.doe@gmial.com","info@stripe.com","test@mailinator.com"]}, timeout=30)
r.raise_for_status()
for row in r.json()["results"]:
    print(row)

Endpoints: /api/validate validate up to 10 email addresses

Add it to your AI agent (MCP)

A remote MCP server at https://mailvett.cybermax-tools.workers.dev/mcp (streamable HTTP, no auth). Read-only tools with JSON schemas, so agents know exactly what to send.

// Claude Desktop, Cursor, VS Code, any MCP client (remote, no key)
{
  "mcpServers": {
    "mailvett": { "type": "http", "url": "https://mailvett.cybermax-tools.workers.dev/mcp" }
  }
}

# Claude Code
claude mcp add --transport http mailvett https://mailvett.cybermax-tools.workers.dev/mcp

# Tools: validate_emails
# e.g. validate_emails({"emails":["jane.doe@gmial.com"]})

• validate_emails
  Check up to 10 email addresses: syntax, whether the domain exists and has mail servers (MX), mail provider, disposable, role account (info@, sales@), free provider, likely typo with a suggested fix, domain age, SPF and DMARC. Returns verdict (deliverable_likely/risky/undeliverable/invalid), score 0-100 and reason codes per address. Does not verify that the mailbox itself exists.

FAQ