# Email verification API

Check email syntax, DNS and MX records, disposable providers, role addresses, free providers and SPF/DMARC presence. Returns likely-deliverable, risky, undeliverable or invalid with reasons. No message is sent and the mail server is not contacted. These are DNS and syntax signals, not proof that a mailbox exists or accepts delivery. Use before sending mail or saving a signup.

## When an agent wants this

- Check an address before sending mail or saving a signup
- Flag disposable, role and free-provider addresses
- See whether the domain has MX records and SPF/DMARC

## Email verification, validation: verify an address with syntax, MX and disposable-address checks, no mail sent

Email verification, validation: verify an address with syntax, MX and disposable-address checks, no mail sent. $0.01 per successful call; failed calls are never charged.

Check email syntax, DNS and MX records, disposable providers, role addresses, free providers and SPF/DMARC presence. Returns likely-deliverable, risky, undeliverable or invalid with reasons. No message is sent and the mail server is not contacted. These are DNS and syntax signals, not proof that a mailbox exists or accepts delivery. Use before sending mail or saving a signup.

Inputs: address (required): The email address to check.

Free first (25 successful calls per caller, no key):

    curl "https://tools.funwords.eu/email?address=support%40cloudflare.com&trial=1"

With a card key from https://tools.funwords.eu/credits, in a header or, when your client can only fetch a URL, in the URL:

    curl -H "Authorization: Bearer adt_…" "https://tools.funwords.eu/email?address=support%40cloudflare.com"
    curl "https://tools.funwords.eu/email?address=support%40cloudflare.com&api_key=adt_…"

Without a key the same URL answers 402 with x402 and MPP terms, so a wallet client pays USDC per call and retries. Over MCP (https://tools.funwords.eu/mcp) this tool is email.

Example result:

    {
      "address": "support@cloudflare.com",
      "validSyntax": true,
      "domain": "cloudflare.com",
      "domainExists": true,
      "acceptsMail": true,
      "disposable": false,
      "roleAddress": true,
      "freeProvider": false,
      "hasSpf": true,
      "hasDmarc": true,
      "verdict": "likely-deliverable",
      "reasons": [
        "role address, not a person"
      ]
    }

Tool page: https://tools.funwords.eu/tools/email

## Email deliverability check: MX, SPF, DMARC, DKIM and score

Email deliverability check: MX, SPF, DMARC, DKIM and score. $0.03 per successful call; failed calls are never charged.

Email deliverability check for a domain in one call: MX records, SPF and its all-policy, DMARC and its policy, DKIM keys at the common selectors (Google, Microsoft, Mailchimp and others), MTA-STS, TLS-RPT and BIMI, with a 0-100 score, a grade and a list of fixes; optionally also checks one address (syntax, MX, disposable domain). Uses public DNS only and sends no mail. Use before a campaign, when mail lands in spam, or to vet a sender domain.

Inputs: domain (required): The sending domain, such as example.com (or a URL; its host is used); email: Optional address to check as well.

Free first (25 successful calls per caller, no key):

    curl "https://tools.funwords.eu/pack/email-deliverability?domain=github.com&trial=1"

With a card key from https://tools.funwords.eu/credits, in a header or, when your client can only fetch a URL, in the URL:

    curl -H "Authorization: Bearer adt_…" "https://tools.funwords.eu/pack/email-deliverability?domain=github.com"
    curl "https://tools.funwords.eu/pack/email-deliverability?domain=github.com&api_key=adt_…"

Without a key the same URL answers 402 with x402 and MPP terms, so a wallet client pays USDC per call and retries. Over MCP (https://tools.funwords.eu/mcp) this tool is pack_email_deliverability.

Example result:

    {
      "pack": "email-deliverability",
      "domain": "github.com",
      "score": 90,
      "grade": "A",
      "issues": [
        "no BIMI record"
      ],
      "mx": [
        {
          "priority": 1,
          "host": "aspmx.l.google.com"
        }
      ],
      "spf": "v=spf1 ip4:… ~all",
      "spfPolicy": "~all",
      "dmarc": "v=DMARC1; p=reject; …",
      "dmarcPolicy": "reject",
      "dkimSelectors": [
        "google"
      ],
      "mtaSts": true,
      "tlsRpt": true,
      "bimi": false,
      "address": null,
      "failed": {}
    }

Tool page: https://tools.funwords.eu/tools/pack-email-deliverability

## Questions

Docs for agents: https://tools.funwords.eu/llms.txt · OpenAPI: https://tools.funwords.eu/openapi.json · All guides: https://tools.funwords.eu/guides