MAILTYPE — Email Domain Capability Intelligence

Email-domain intelligence: MX capability, provider, disposable status, SPF, DMARC, and MTA-STS.

Quick Install

Automated & IDE Setup

Copy the AI prompt to install this server into Claude Code, Cursor, or another agent — or use 1-click editor setup below.

Add to Cursor Add to VS Code

Manual Client & Custom JSON ConfigExpand JSON ▾

Client Config & Setup

Choose your client or environment

Target File:~/Library/Application Support/Claude/claude_desktop_config.json

claude_desktop_config.json

{
  "mcpServers": {
    "mailtype-email-domain-capability-intelligence": {
      "command": "npx",
      "args": [
        "-y",
        "mailtype-email-domain-capability-intelligence"
      ]
    }
  }
}

💡 Paste the JSON block into your client's configuration file under mcpServers, then restart the application.

Documentation Overview

MAILTYPE

Email/domain → objective mail capability intelligence.

MAILTYPE is a tiny REST + MCP API for applications that need fast, objective domain-level email infrastructure answers before accepting, storing, routing, or acting on an email address.

Live API: https://mailtype-api.onrender.com/docs
OpenAPI: https://mailtype-api.onrender.com/openapi.json
Playground: https://mailtype-api.onrender.com/play?q=gmail.com
MCP endpoint: https://mailtype-api.onrender.com/mcp

What it returns

DOMAIN_EXISTS
CAN_RECEIVE_MAIL
MX records and provider
disposable-domain evidence
SPF
DMARC
MTA-STS
confidence, evidence, and checked_at

Why MAILTYPE

MAILTYPE deliberately does not perform SMTP probing or claim that an individual mailbox exists. It answers the cheaper, objective domain-level questions that software often needs first. UNKNOWN is a valid answer whenever the evidence is insufficient.

REST

Terminal

curl -H "X-API-Key: YOUR_KEY" \
  https://mailtype-api.onrender.com/v1/domain/gmail.com

curl -H "X-API-Key: YOUR_KEY" \
  https://mailtype-api.onrender.com/v1/email/person@gmail.com

MCP

Endpoint: POST https://mailtype-api.onrender.com/mcp

Tool: inspect_mail_domain

Input:

config.json

{"input":"gmail.com"}

Public discovery endpoints

Docs: https://mailtype-api.onrender.com/docs
Playground: https://mailtype-api.onrender.com/play?q=gmail.com
OpenAPI 3.1: https://mailtype-api.onrender.com/openapi.json
Sources and methodology: https://mailtype-api.onrender.com/sources
Health: https://mailtype-api.onrender.com/health

Data and standards

MAILTYPE uses DNS evidence plus a maintained legally reusable disposable-domain dataset. The API exposes its methodology and source disclosure publicly. Relevant standards include RFC 5321, RFC 7505 (Null MX), RFC 7208 (SPF), RFC 7489 (DMARC), and RFC 8461 (MTA-STS).

Hard boundary

MAILTYPE does not verify that a mailbox exists, connect to recipient SMTP servers, send email, infer deliverability from opaque scores, or claim CAN_RECEIVE_MAIL=YES without explicit MX evidence. If a domain exists but explicit MX evidence is insufficient, MAILTYPE returns UNKNOWN.

Stranger Verification Standard

Our own tests, health probes, validators, uptime traffic, and known internal callers do not count as adoption. A tool call alone does not automatically become a verified stranger; outside calls remain unverified until evidence supports credible real use.

Keywords

email API · domain API · MX lookup API · disposable email domain API · SPF API · DMARC API · MTA-STS API · email infrastructure · email validation preflight · MCP server · developer API

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Frequently Asked Questions about MAILTYPE — Email Domain Capability Intelligence

Add the following block to your claude_desktop_config.json under mcpServers: "mcpServers": { "mailtype-email-domain-capability-intelligence": { "command": "npx", "args": ["-y", "MAILTYPE — Email Domain Capability Intelligence"] } }

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Technical Specs & Signals

CategoryCommunication

27Quality signal: Emerging · 27/100How this signal is calculated ▾

Server availabilityNot measured

Not scored for repo-hosted servers — we can't reach the running server, only its GitHub page. Hosted MCP endpoints are health-checked live.

Verified ownership8/20

Documentation & tools11/30

Adoption & activity1/15

Community engagement0/10

A guidance signal from public completeness & health data — not a user rating. New listings start lower and rise as they add docs, get verified, and grow adoption. Signals we can't observe for a listing are skipped, not counted against it.

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{ "mcpServers": { "mailtype-email-domain-capability-intelligence": { "command": "npx", "args": [ "-y", "mailtype-email-domain-capability-intelligence" ] } } }