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MAILTYPE — Email Domain Capability Intelligence

Official registry Productivity

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

Source code Website Documentation

Install

Add this to your client's MCP configuration (Claude Desktop: claude_desktop_config.json; Cursor: .cursor/mcp.json; VS Code and others use the same "mcpServers" shape).

Remote (streamable-http)
Claude Code 
claude mcp add --transport http mailtype-email-domain-capability-intelli 'https://mailtype-api.onrender.com/mcp' --header 'X-API-Key: <MAILTYPE API key>'
JSON configuration (Claude Desktop, Cursor, VS Code) 
{
    "mcpServers": {
        "mailtype-email-domain-capability-intelli": {
            "type": "http",
            "url": "https://mailtype-api.onrender.com/mcp",
            "headers": {
                "X-API-Key": "<MAILTYPE API key>"
            }
        }
    }
}

Documentation

From the project's README on GitHub, refreshed weekly. Links open on GitHub.

Contents
  1. MAILTYPE
  2. What it returns
  3. Why MAILTYPE
  4. REST
  5. MCP
  6. Public discovery endpoints
  7. Data and standards
  8. Hard boundary
  9. Stranger Verification Standard
  10. Keywords

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

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:

{"input":"gmail.com"}

Public discovery endpoints

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

Frequently asked questions

What is MAILTYPE — Email Domain Capability Intelligence?

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

How do I install MAILTYPE — Email Domain Capability Intelligence?

It runs as a remote server. In Claude Code: claude mcp add --transport http mailtype-email-domain-capability-intelli 'https://mailtype-api.onrender.com/mcp' --header 'X-API-Key: <MAILTYPE API key>'. For other clients, paste the JSON configuration from this page into their MCP settings.

Does MAILTYPE — Email Domain Capability Intelligence need an API key?

Yes. It expects X-API-Key, which you set in its configuration.

Is MAILTYPE — Email Domain Capability Intelligence open source?

Its code is public on GitHub, but the repository does not declare a standard license.

Who maintains MAILTYPE — Email Domain Capability Intelligence?

It is published by GSterlingPress. AI.tn lists it but does not maintain or endorse it.

From the official MCP Registry. Listing is not an endorsement: review a server's code and permissions before giving it access to your data.