Email Deliverability Checker MCP Server

by kryptoscan Your server? Claim it

answering

Email Deliverability Checker is answering right now. Last checked 1 min ago. It exposes 3 tools. Last commit 30 Oct 2026.

Check SPF, DKIM, DMARC, blocklists, reverse DNS and email headers against Gmail/Yahoo sender rules.

Uptime history 6 days of history

6 days agonow

100.0%

Uptime 24h

92 of 92 checks

Tools

read from the server

365 ms

Response time

average over 24h

Stars

last commit 30 Oct 2026

Nothing serious here today

Today is the operative word: we check Email Deliverability Checker every 15 minutes and re-read its code on every release. Watch it and you find out the day that stops being true.

Connect this server

Endpoint below is the one we actually reach during checks — not the one copied from a README. Last verified 1 min ago.

Claude Code Claude Desktop Codex Cursor VS Code

run in your terminal

claude mcp add email-deliverability-mcp --transport http https://api.ownmailserver.com/tools/mcp

Settings → Connectors → Add custom connector, then paste this address

https://api.ownmailserver.com/tools/mcp

~/.codex/config.toml

[mcp_servers.email-deliverability-mcp]
url = "https://api.ownmailserver.com/tools/mcp"

.cursor/mcp.json

{
  "mcpServers": {
    "email-deliverability-mcp": {
      "url": "https://api.ownmailserver.com/tools/mcp"
    }
  }
}

.vscode/mcp.json

{
  "servers": {
    "email-deliverability-mcp": {
      "type": "http",
      "url": "https://api.ownmailserver.com/tools/mcp"
    }
  }
}

Available tools 3

Read directly from the server with tools/list, grouped by what they act on. If a tool disappears, we record the date.

domain

check_domain

Check a domain's SPF (including the 10-DNS-lookup limit), DMARC policy and reporting, DKIM keys on common selectors, and MX records. Returns problems ranked by severity with the fix for each, plus the email services the domain uses.

check_email_headers

Check a received email's headers against Gmail's and Yahoo's bulk sender requirements: SPF, DKIM and DMARC results, From domain alignment, one-click unsubscribe (and whether DKIM covers it), TLS, reverse DNS and Message-ID. Use the full headers as the recipient got them (Gmail: Show original).

sending

check_sending_ip

Check a mail server's IP: reverse DNS (PTR) and whether it resolves back to the IP, and listings on Spamhaus ZEN, Barracuda, SpamCop, PSBL, Mailspike and UCEPROTECT level 1. A refused Spamhaus query is reported as unknown, never as a listing.

Endpoints

URL	Transport	State	Latency	Checked
https://api.ownmailserver.com/tools/mcp	streamable-http	answering	327 ms	1 min ago

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Email Deliverability Checker — questions

Answers built from our own checks of this server.

What can Email Deliverability Checker do?

It exposes 3 tools, read directly from the server on our last check. Among them: check_domain, check_email_headers, check_sending_ip. The full list with descriptions is on this page — we take it from the server itself via tools/list, not from a README. How MCP servers expose tools in the first place →

Is Email Deliverability Checker working right now?

We send a real MCP handshake every 15 minutes. Over the last 24 hours 92 of 92 checks got a reply (100.0%), average response time 365 ms. The bar chart above shows every period we have measured.

How do I connect Email Deliverability Checker?

Copy the ready config from this page. We generate it for Claude Code, Claude Desktop, Codex, Cursor and VS Code, each in the form that client actually reads. It is a remote server, so there is nothing to install — the client connects to the address.

Does Email Deliverability Checker need an API key?

No. Email Deliverability Checker completed a full MCP handshake with us as an anonymous client and listed its tools without asking for anything. All 3 of them are readable on this page. This is what we observed, not what the docs claim.

How fast is Email Deliverability Checker?

It answers our handshake in 365 ms on average, which is faster than 37% of all working MCP servers we measure. The comparison comes from our own checks across the whole registry, every 15 minutes.

Is Email Deliverability Checker open source?

The code is open source: it is published under the MIT licence, written in TypeScript, 0 stars on GitHub and 1 open issue. The licence covers the code in the repository, not the hosted service at api.ownmailserver.com, which runs on its operator's own terms.