DomainCanary MCP Server

by domaincanary Your server? Claim it

answering

DomainCanary is answering right now. Last checked 12 min ago. It exposes 4 tools.

Check a domain's DMARC, SPF and DKIM, build SPF records, explain bounces, read DMARC reports.

Uptime history 10 days of history

10 days agonow

100.0%

Uptime 24h

91 of 91 checks

Tools

read from the server

263 ms

Response time

average over 24h

open, no key

Access

streamable-http

Nothing serious here today

Today is the operative word: we check DomainCanary 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 12 min ago.

Claude Code Claude Desktop Codex Cursor VS Code

run in your terminal

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

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

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

~/.codex/config.toml

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

.cursor/mcp.json

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

.vscode/mcp.json

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

Available tools 4

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

analyze

analyze_report

Use this when someone has a DMARC aggregate report and wants to know which senders passed and which failed. The report is the XML, .gz or .zip file that receivers such as Google and Yahoo email to the address in a domain's rua tag. In ChatGPT, pass the uploaded file. Elsewhere, pass the report XML as text. Returns totals per report and each sending IP address with its SPF, DKIM and DMARC results. The result gives a next step for the report's domain and a link to a live check of that domain's DNS records. Nothing from the report is stored.

build

build_spf

Use this when someone lists the services that send their email and wants the SPF record to publish, or wants a sender added to the SPF record they already have. Takes provider names such as Google Workspace or Mailchimp, include terms such as include:spf.example.com, or IP addresses, and returns one merged record with its count of DNS lookups against the limit of ten. Pass the domain when you know it, so the result includes the senders already in its published record.

domain

check_domain

Use this when someone asks whether a domain's email authentication is set up correctly, why mail from a domain fails DMARC, SPF or DKIM, or which DNS records to publish for it. Reads the domain's live DMARC, SPF and DKIM records and returns what is wrong with each, plus the records to add or change. Pass a DKIM selector when you know it. Without one, common selectors are tried. Takes a domain name only, not a mailbox address or an IP address.

explain

explain_bounce

Use this when someone pastes a bounce message, an SMTP reply such as 550 5.7.26, or an Authentication-Results header and asks what it means or how to fix it. Returns what the receiving server refused, what to change, when it clears, and the page that explains it. Works from the pasted text alone and reads no DNS records.

Endpoints

URL	Transport	State	Latency	Checked
https://domaincanary.com/mcp	streamable-http	answering	235 ms	12 min ago

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DomainCanary — questions

Answers built from our own checks of this server.

What can DomainCanary do?

It exposes 4 tools, read directly from the server on our last check. Among them: analyze_report, build_spf, check_domain, explain_bounce. 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 DomainCanary 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 263 ms. The bar chart above shows every period we have measured.

How do I connect DomainCanary?

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 DomainCanary need an API key?

No. DomainCanary completed a full MCP handshake with us as an anonymous client and listed its tools without asking for anything. All 4 of them are readable on this page. This is what we observed, not what the docs claim.

How fast is DomainCanary?

It answers our handshake in 263 ms on average, which is faster than 52% of all working MCP servers we measure. The comparison comes from our own checks across the whole registry, every 15 minutes.