ARC-Relay MCP Server

by arc-relay Your server? Claim it

answering

ARC-Relay is answering right now. Last checked 6 min ago. It exposes 6 tools.

DMARC-safe email forwarding for agents: aliases, DNS health checks, and MCP tools on your domains.

Uptime history 50 days of history · worst day 96%

50 days agonow

100.0%

Uptime 24h

92 of 92 checks

Tools

read from the server

562 ms

Response time

average over 24h

open, no key

Access

streamable-http

What changed 2

Every tool that appeared, vanished or quietly changed what it asks for. Recorded since 14 September 2026. No other catalogue keeps this.

4 Oct a tool description was rewritten network_stats

14 Sep a tool changed version

Nothing serious here today

Today is the operative word: we check ARC-Relay 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 6 min ago.

Claude Code Claude Desktop Codex Cursor VS Code

run in your terminal

claude mcp add mcp --transport http https://arc-relay.com/mcp

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

{
  "mcpServers": {
    "mcp": {
      "url": "https://arc-relay.com/mcp"
    }
  }
}

~/.codex/config.toml

[mcp_servers.mcp]
url = "https://arc-relay.com/mcp"

.cursor/mcp.json

{
  "mcpServers": {
    "mcp": {
      "url": "https://arc-relay.com/mcp"
    }
  }
}

.vscode/mcp.json

{
  "mcpServers": {
    "mcp": {
      "url": "https://arc-relay.com/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.

network

network_leaderboard

View top relay nodes ranked by reputation score. Filter by region.

network_stats

Get public relay network statistics — total nodes, active nodes, messages routed, delivery rate, and the average DMARC rate nodes report about themselves (rates are null until there is traffic).

dmarc

check_dmarc

Check a domain's DMARC, SPF, and MX records. Use this to diagnose email authentication issues.

check_email_health

Get a 0-100 email health score for any domain. Checks DMARC, SPF, MX, and DKIM records and returns a letter grade (A+ to F) with actionable recommendations. Use this to audit any domain's email security posture.

health

check_health

Check ARC-Relay service health and uptime.

spf

check_spf

Validate a domain's SPF record. Shows mechanisms, DNS lookup count, and warns if over the 10-lookup limit.

Endpoints

URL	Transport	State	Latency	Checked
https://arc-relay.com/mcp	streamable-http	answering	571 ms	6 min ago

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ARC-Relay — questions

Answers built from our own checks of this server.

What can ARC-Relay do?

It exposes 6 tools, read directly from the server on our last check. Among them: check_dmarc, check_email_health, check_health, check_spf, network_leaderboard, network_stats. 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 ARC-Relay 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 562 ms. The bar chart above shows every period we have measured.

How do I connect ARC-Relay?

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 ARC-Relay need an API key?

No. ARC-Relay 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 ARC-Relay?

It answers our handshake in 562 ms on average, which is faster than 20% of all working MCP servers we measure. That is on the slow side — worth knowing if the tool sits inside an interactive loop. The comparison comes from our own checks across the whole registry, every 15 minutes.