scan.mx Email Diagnostics MCP Server

by scan Your server? Claim it

answering

scan.mx Email Diagnostics is answering right now. Last checked 6 min ago. It exposes 6 tools.

Check email deliverability for a domain: MX, SPF, DKIM, DMARC, blacklists. Graded, no key.

Uptime history 51 days of history · worst day 96%

51 days agonow

97.8%

Uptime 24h

89 of 91 checks

Tools

read from the server

183 ms

Response time

average over 24h

open, no key

Access

streamable-http

What changed 1

Every tool that appeared, vanished or quietly changed what it asks for. Recorded since 18 August 2026. No other catalogue keeps this.

17 Aug a tool description was rewritten check_domain

scan.mx Email Diagnostics does not always answer

Over the last week it answered 98.7% of our checks. We check every 15 minutes, so you hear about the next outage within the hour — not from your users.

Connect this server

Endpoint below is the one we actually reach during checks — not the one copied from a README. Last verified 6 min ago.

Claude Code Claude Desktop Codex Cursor VS Code

run in your terminal

claude mcp add diagnostics --transport http https://api.scan.mx/mcp

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

{
  "mcpServers": {
    "diagnostics": {
      "url": "https://api.scan.mx/mcp"
    }
  }
}

~/.codex/config.toml

[mcp_servers.diagnostics]
url = "https://api.scan.mx/mcp"

.cursor/mcp.json

{
  "mcpServers": {
    "diagnostics": {
      "url": "https://api.scan.mx/mcp"
    }
  }
}

.vscode/mcp.json

{
  "mcpServers": {
    "diagnostics": {
      "url": "https://api.scan.mx/mcp"
    }
  }
}

Available tools 6

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

blacklist

check_blacklist

Check whether the domain and its mail server IPs are listed on the Spamhaus (ZEN, DBL, ZRD, AuthBL), SpamCop, GBUdb and PSBL blocklists.

check

check_mx

Check the MX records of a domain: presence, hostnames, resolution, null-MX, and common misconfigurations.

dkim

check_dkim

Check DKIM signing keys for a domain. Without a selector, common provider selectors are probed. Pass an explicit selector to look up that exact key at selector._domainkey.

dmarc

check_dmarc

Check the domain DMARC policy at _dmarc: presence, policy strength (none/quarantine/reject), and reporting.

domain

check_domain

Run the full email and DNS deliverability check for a domain: MX, SPF, DKIM, DMARC, DNS health, provider detection, and blacklists. Returns a letter grade (A+ to F, where specific weaknesses cap the grade), a 0 to 100 score, and every individual check with its RFC reference. Set include_smtp to also run a live SMTP probe of the mail servers: the probe is non-blocking, so when smtp_status is "pending" or "running" call this tool again (poll_after_seconds hints how long to wait) until smtp_status is "complete" and the SMTP checks appear in checks.

spf

check_spf

Check the domain SPF policy: presence, syntax, the all qualifier, and the 10-lookup limit.

Endpoints

URL	Transport	State	Latency	Checked
https://api.scan.mx/mcp	streamable-http	answering	256 ms	6 min ago

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scan.mx Email Diagnostics — questions

Answers built from our own checks of this server.

What can scan.mx Email Diagnostics do?

It exposes 6 tools, read directly from the server on our last check. Among them: check_blacklist, check_dkim, check_dmarc, check_domain, check_mx, check_spf. 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 scan.mx Email Diagnostics working right now?

We send a real MCP handshake every 15 minutes. Over the last 24 hours 89 of 91 checks got a reply (97.8%), average response time 183 ms. The bar chart above shows every period we have measured.

How do I connect scan.mx Email Diagnostics?

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 scan.mx Email Diagnostics need an API key?

No. scan.mx Email Diagnostics completed a full MCP handshake with us as an anonymous client and listed its tools without asking for anything. All 6 of them are readable on this page. This is what we observed, not what the docs claim.

How fast is scan.mx Email Diagnostics?

It answers our handshake in 183 ms on average, which is faster than 73% of all working MCP servers we measure. The comparison comes from our own checks across the whole registry, every 15 minutes.