# Arc Relay MCP server

Source: https://glimind.com/server/mcp-registry%2Fcom.arc-relay%2Fmcp
Registry id: `mcp-registry/com.arc-relay/mcp`
Status: live (checked 2026-10-27T04:30:22.135Z)

## Verdict

Arc Relay MCP server answered 99.87% of Glimind's liveness checks over 30 days, better than 27% of MCP servers, with 1375 ms median handshake and 4 outages in 90 days. Its agent-readiness grade is A (93/100) across 6 tools, costing an agent about 483 tokens to load. Checked every few minutes; no tool is ever called.

## Measurements (30 days)

| Metric | Value | Better than |
|---|---|---|
| Uptime, 30 days | 99.87% | 27% of MCP servers |
| Median handshake latency | 1375 ms | 10% of MCP servers |
| p95 handshake latency | 3984 ms | — |
| Checks in 30 days | 4,959 | — |
| Outages, 90 days | 4 | — |
| Median recovery | 14 min | — |
| Agent-readiness score | 93/100 (A) | 76% of MCP servers |
| Tools | 6 | — |
| Tool-list size for an agent | ~483 tokens | 89% of MCP servers |
| Days observed | 29 | — |

## Install

```json
{
  "mcpServers": {
    "arc-relay-mcp-server": {
      "type": "http",
      "url": "https://arc-relay.com/mcp"
    }
  }
}
```

Claude Code:

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

## Tools (6)

- `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
- `check_health`: Check ARC-Relay service health and uptime.
- `check_spf`: Validate a domain's SPF record. Shows mechanisms, DNS lookup count, and warns if over the 10-lookup limit.
- `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

Measured by Glimind (https://glimind.com): MCP handshake + tool list only, no tool is ever called. CC BY 4.0.