MX Verdict MCP Server

by mxverdict Your server? Claim it

answering

MX Verdict is answering right now. Last checked 7 min ago. It exposes 7 tools.

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

Uptime history 14 days of history

14 days agonow

100.0%

Uptime 24h

92 of 92 checks

Tools

read from the server

174 ms

Response time

average over 24h

open, no key

Access

streamable-http

Nothing serious here today

Today is the operative word: we check MX Verdict 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 7 min ago.

Claude Code Claude Desktop Codex Cursor VS Code

run in your terminal

claude mcp add mxverdict --transport http https://mxverdict.com/mcp

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

{
  "mcpServers": {
    "mxverdict": {
      "url": "https://mxverdict.com/mcp"
    }
  }
}

~/.codex/config.toml

[mcp_servers.mxverdict]
url = "https://mxverdict.com/mcp"

.cursor/mcp.json

{
  "mcpServers": {
    "mxverdict": {
      "url": "https://mxverdict.com/mcp"
    }
  }
}

.vscode/mcp.json

{
  "mcpServers": {
    "mxverdict": {
      "url": "https://mxverdict.com/mcp"
    }
  }
}

Available tools 7

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 an IP address or a domain is listed on public DNS blocklists (DNSBLs). A domain is checked on domain blocklists only; to check a mail server, give its IP address.

dkim

check_dkim

Check a domain's DKIM public keys in DNS. With a selector (the s= tag of a DKIM-Signature header), checks that selector's key; without one, probes common selector names. Finding no key on common names does not prove DKIM is missing: selectors cannot be listed from DNS.

dmarc

check_dmarc

Check a domain's DMARC record: whether it exists and is valid, its policy (none, quarantine or reject), alignment, and where reports are sent.

dns

dns_lookup

Look up DNS records of a name. Type ALL (the default) queries A, AAAA, CNAME, MX, NS, TXT, SOA and CAA; any single type can be asked for. An IP address gives its reverse DNS (PTR) lookup.

check_email_domain

Check everything about a domain's email setup in one call: SPF, DMARC, MX, DKIM on common selectors, domain blocklists, MTA-STS, TLS-RPT and BIMI. Use it for a general question such as "is email set up correctly for example.com".

lookup

lookup_mx

Look up a domain's MX records (its incoming mail servers), their IP addresses and reverse DNS. DNS only: it does not connect to the mail servers.

spf

check_spf

Check a domain's SPF record: whether it exists and is valid, how many of the 10 allowed DNS lookups it uses, and how its all mechanism treats mail from servers that are not listed.

Endpoints

URL	Transport	State	Latency	Checked
https://mxverdict.com/mcp	streamable-http	answering	162 ms	7 min ago

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MX Verdict — questions

Answers built from our own checks of this server.

What can MX Verdict do?

It exposes 7 tools, read directly from the server on our last check. Among them: check_blacklist, check_dkim, check_dmarc, check_email_domain, check_spf, dns_lookup and 1 more. 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 MX Verdict 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 174 ms. The bar chart above shows every period we have measured.

How do I connect MX Verdict?

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 MX Verdict need an API key?

No. MX Verdict completed a full MCP handshake with us as an anonymous client and listed its tools without asking for anything. All 7 of them are readable on this page. This is what we observed, not what the docs claim.

How fast is MX Verdict?

It answers our handshake in 174 ms on average, which is faster than 68% of all working MCP servers we measure. The comparison comes from our own checks across the whole registry, every 15 minutes.