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

$0.02 per call · failed calls are never charged · no account or API key needed

One call to check a domain's email setup: 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.

Run it free (25 free calls) Buy credits by card (from $5) Example result (JSON)

Try it with your own inputs

The sending domain, such as example.com (or a URL; its host is used)

Uses one of your 25 free calls. Nothing is charged, and a call that fails is not counted.

Inputs

NameTypeDescription
domain (required)stringThe sending domain, such as example.com (or a URL; its host is used)
emailstringOptional address to check as well

Request

Over HTTP, with a card key from /credits:

curl -H "Authorization: Bearer adt_…" "https://agent-data-tools.revmesh2074.workers.dev/pack/email-deliverability?domain=github.com"

Or one of your 25 free calls, no key:

curl "https://agent-data-tools.revmesh2074.workers.dev/pack/email-deliverability?domain=github.com&trial=1"

Without a key, the same URL answers 402 Payment Required with x402 and MPP terms, so an agent with a wallet pays per call in USDC (Base, Polygon, Arbitrum or Solana over x402; Base or Tempo over MPP) and retries.

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": {}
}

From an AI agent (MCP)

Add the MCP server to Claude, Cursor or any MCP client. This tool is pack_email_deliverability, and the first 25 successful calls are free:

https://agent-data-tools.revmesh2074.workers.dev/mcp

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