Email provider classifier from MX records API

Resolves a domain's MX records and classifies the email hosting provider (Google Workspace, Microsoft 365, Proton, Zoho, Fastmail, Amazon SES, self-hosted, ...) from the MX hostnames, then reports SPF/DMARC presence as a spam-readiness signal. The value-add: opaque MX hostnames become a named provider plus deliverability posture. Answers 'who hosts this domain's email', 'is this Google Workspace or Microsoft 365', 'does this domain have SPF and DMARC', 'can this domain receive mail'.

Price$0.01per request

MethodPOST

Route/v1/web/mx-provider

StatusLive

MIME typeapplication/json

Rate limit60/minute

Cache3600s public

webmxemailmx-providerdnsspfdmarcdeliverability

API URLhttps://x402.hexl.dev/v1/web/mx-provider

Integration docs

Example request

{
  "domain": "github.com"
}

Example response

{
  "domain": "github.com",
  "provider": "Google Workspace",
  "isHosted": true,
  "mxRecords": [
    {
      "priority": 1,
      "exchange": "aspmx.l.google.com"
    },
    {
      "priority": 5,
      "exchange": "alt1.aspmx.l.google.com"
    }
  ],
  "spf": true,
  "dmarc": true,
  "spamReadiness": "ok",
  "flags": []
}

Input schema

{
  "type": "object",
  "required": [
    "domain"
  ],
  "properties": {
    "domain": {
      "type": "string",
      "examples": [
        "github.com"
      ]
    }
  }
}

Output schema

{
  "type": "object",
  "additionalProperties": true
}