Deliverability Doctor MCP Server

by integrity-os Your server? Claim it

answering

Deliverability Doctor is answering right now. Last checked 14 min ago. It exposes 2 tools. Last commit 25 Aug 2026.

Check if a domain can be email-spoofed: SPF, DMARC, DKIM, MX graded from public DNS. Authless.

Uptime history 54 days of history · worst day 90%

54 days agonow

100.0%

Uptime 24h

91 of 91 checks

Tools

read from the server

56 ms

Response time

average over 24h

Stars

last commit 25 Aug 2026

Nothing serious here today

Today is the operative word: we check Deliverability Doctor 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 14 min ago.

Claude Code Claude Desktop Codex Cursor VS Code

run in your terminal

claude mcp add deliverability-doctor --transport http https://deliverability-doctor.deliverability-doctor.workers.dev/mcp

~/Library/Application Support/Claude/claude_desktop_config.json

{
  "mcpServers": {
    "deliverability-doctor": {
      "url": "https://deliverability-doctor.deliverability-doctor.workers.dev/mcp"
    }
  }
}

~/.codex/config.toml

[mcp_servers.deliverability-doctor]
url = "https://deliverability-doctor.deliverability-doctor.workers.dev/mcp"

.cursor/mcp.json

{
  "mcpServers": {
    "deliverability-doctor": {
      "url": "https://deliverability-doctor.deliverability-doctor.workers.dev/mcp"
    }
  }
}

.vscode/mcp.json

{
  "mcpServers": {
    "deliverability-doctor": {
      "url": "https://deliverability-doctor.deliverability-doctor.workers.dev/mcp"
    }
  }
}

Available tools 2

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

compare

compare_email_security

Runs the email-security check on 2–5 domains and returns a comparison table with per-domain grades. Useful for checking your domain against competitors.

check_email_security

Checks whether a domain can be email-spoofed, using public DNS only. Verifies SPF (including the RFC 7208 multiple-record permerror), DMARC policy and reporting, MX, and DKIM at common selectors. Returns a graded report with concrete fixes. Accepts a bare domain, a URL, or an email address. Nothing is sent to the domain.

Endpoints

URL	Transport	State	Latency	Checked
https://deliverability-doctor.deliverability-doctor.workers.dev/mcp	streamable-http	answering	48 ms	14 min ago

Alternatives to Deliverability Doctor

same job, measured the same way

Email Check

by kaiv

Email posture for any domain: can it receive mail, can it be spoofed? MX, SPF and DMARC.

4 tools answering

DnsGuard

by workers-mike-tusa-dnsguard

Check a domain's email authentication: SPF, DKIM, DMARC, BIMI, MX, MTA-STS, TLS-RPT. Score + fixes.

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Domain Mail Check

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Check how a domain is set up for email and who it is registered with, from public DNS data.

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InboxGuards Email Check

by inboxguardstest-api

Check emails before you send, and get a $1 SPF/DKIM/DMARC fix plan for your domain. Pay per call.

4 tools answering

MX Verdict

by mxverdict

Free, read-only email and DNS checks: SPF, DKIM, DMARC, MX, DNS records, blocklists, domain health.

7 tools answering

scan.mx Email Diagnostics

by scan

Email deliverability check: MX, SPF, DKIM, DMARC, blacklists, MTA-STS, DNSSEC, BIMI. Graded, no key.

9 tools answering

Email Deliverability

by inboxguard

Scan and fix a domain's email deliverability (SPF, DKIM, DMARC, MTA-STS, BIMI, DNS blocklists).

28 tools answering

Domainposture

by domainposture

Remote MCP server: 19 domain-hygiene and email-auth tools (DNS, SPF, DMARC, DKIM, TLS).

22 tools answering

Deliverability Doctor — questions

Answers built from our own checks of this server.

What can Deliverability Doctor do?

It exposes 2 tools, read directly from the server on our last check. Among them: check_email_security, compare_email_security. 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 Deliverability Doctor working right now?

We send a real MCP handshake every 15 minutes. Over the last 24 hours 91 of 91 checks got a reply (100.0%), average response time 56 ms. The bar chart above shows every period we have measured.

How do I connect Deliverability Doctor?

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

Does Deliverability Doctor need an API key?

No. Deliverability Doctor completed a full MCP handshake with us as an anonymous client and listed its tools without asking for anything. All 2 of them are readable on this page. This is what we observed, not what the docs claim.

How fast is Deliverability Doctor?

It answers our handshake in 56 ms on average, which is faster than 94% of all working MCP servers we measure. That puts it in the quick quarter of the ecosystem. The comparison comes from our own checks across the whole registry, every 15 minutes.

Is Deliverability Doctor open source?

Yes — it is published under the MIT licence, written in JavaScript and 0 stars on GitHub. The source link is on this page, so you can read exactly what it does with your data before you connect it.