# ARC-Relay (remote · arc-relay.com)

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

- Trust score: 82/100 (high trust)
- Change this week: +2
- Registry status: active
- Liveness: live
- Owner verified: no
- Last scored: 2026-10-01

## Components

- remote · `arc-relay.com`: 82/100 (this document), [markdown](https://verifymcp.io/servers/com-arc-relay-mcp/arc-relay.md), [page](https://verifymcp.io/servers/com-arc-relay-mcp/arc-relay)

## Channel facts

- Endpoint: `https://arc-relay.com/mcp`
- Transports: `streamable-http`
- Auth: `required`
- Version: `1.2.0`

## Trust breakdown

How this component scores in each security and reliability category. Every signal is checked automatically against the live server, and we only credit what we can confirm. Scores are 0–100 per category. Scoring method: https://verifymcp.io/docs/scoring (what has changed: https://verifymcp.io/docs/scoring/changelog)

Scored 2026-10-01.

- **Endpoint Security**: 63/100
  - The endpoint's TLS certificate is valid, in date, and uses a strong key.
  - Authorisation not fully verified: no authorisation is required to call this server, and 6 tool(s) never declared a destructiveHint. The MCP spec treats an absent hint as destructive by default, so we cannot call this surface safe.
  - HTTPS is enforced; there's no plaintext access path.
  - The HSTS (Strict-Transport-Security) header is present.
  - DNSSEC check failed: this domain isn't protected by DNSSEC.
- **Transport & Reachability**: 100/100
  - Verified streamable-http transport via a live MCP handshake.
- **Schema Quality & AI Usability**: 81/100
  - 83% of prompts and resources have a non-trivial description (not blank, and not just the item's name).
  - AI-judged instruction clarity (excellent).
  - Tool/resource definitions use about 809 tokens (~67/item across 12 items; 6 tools + 6 resources), lean.
  - Usage-examples check failed: none of the tools include examples.
- **Stability & Change Management**: 100/100
  - No destabilizing schema changes in the last 30 days.
- **Tool Coverage**: 100/100
  - 100% of tools have a non-trivial description (not blank, and not just the tool's name).
  - 100% of tool parameters carry a description.
- **Tool Safety**: 100/100
  - No prompt-injection markers were found in the server instructions, tool names or descriptions we captured.
  - We read all 6 captured tool definition(s), and no name or description among them implies an irreversible operation.
  - An AI judge read all 8 captured unit(s) of tool text and found none that tries to manipulate the model reading it.
- **Capabilities**: 100/100
  - Implements a current MCP spec version (2026-07-28).

## Install

### How do I install the ARC-Relay MCP server?

ARC-Relay is a hosted endpoint at https://arc-relay.com/mcp, so there is nothing to install locally. Ready-made configuration for Claude, Cursor, VS Code, Codex and 5 more is on this page, copied from each client's own documentation.

### Claude

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

### Cursor

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

### VS Code

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

### Codex

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

### opencode

```json
{
  "$schema": "https://opencode.ai/config.json",
  "mcp": {
    "com-arc-relay-mcp": {
      "type": "remote",
      "url": "https://arc-relay.com/mcp",
      "enabled": true
    }
  }
}
```

### OpenClaw

```bash
openclaw mcp add com-arc-relay-mcp --url 'https://arc-relay.com/mcp' --transport streamable-http
```

### Hermes

```yaml
mcp_servers:
  com-arc-relay-mcp:
    url: "https://arc-relay.com/mcp"
```

### Netclaw

```json
{
  "McpServers": {
    "com-arc-relay-mcp": {
      "Transport": "http",
      "Url": "https://arc-relay.com/mcp"
    }
  }
}
```

### Vellum

```bash
assistant mcp add com-arc-relay-mcp -t streamable-http -u 'https://arc-relay.com/mcp'
```

### Other

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

The mcpServers block is a cross-client convention. Remote transports vary, so check your client's docs.

## Changelog

Every change recorded for this component, newest first. Days that predate change tracking, or that we cannot explain, say so: "we were watching and nothing happened" and "we were not watching" are different claims.

### 2026-09-28 (score 82, 0)

- [functional] We updated how we score, so this day's move reflects our rubric, not a change to the server

### 2026-09-27 (score 82, +1)

- [security] Stability: 0.97 → pass

### 2026-09-25 (score 81, +1)

- [functional] We updated how we score, so this day's move reflects our rubric, not a change to the server

### 2026-09-23 (score 80, +1)

No change was recorded against any check on this day. Stability & Change Management went from 83 to 87. That category is still filling its 30-day observation window: 25 days of observed history at the previous scan, 26 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-09-20 (score 79, +1)

No change was recorded against any check on this day. Stability & Change Management went from 73 to 77. That category is still filling its 30-day observation window: 22 days of observed history at the previous scan, 23 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-09-18 (score 78, +1)

No change was recorded against any check on this day. Stability & Change Management went from 67 to 70. That category is still filling its 30-day observation window: 20 days of observed history at the previous scan, 21 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-09-16 (score 77, +1)

No change was recorded against any check on this day. Stability & Change Management went from 60 to 63. That category is still filling its 30-day observation window: 18 days of observed history at the previous scan, 19 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-09-15 (score 76, −1)

- [security] The server rewrote its instructions, which are the text every model session reads
- [functional regression] Schema quality: 100% → 83%
- [functional regression] Schema quality: 57 → 67
- [functional] New resource “arc-relay-deliverability-audit”
- [functional] New resource “arc-relay-domain-setup”
- [functional] New resource “arc-relay-relay-network”
- [functional] New resource “dns-records.md”
- [functional] Server version: 1.2.0 → 1.3.0

## MCP tools (6)

### `check_dmarc` (~48 tokens)

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

Input parameters:

- `domain` (string, required): Domain name to check (e.g. example.com)

### `check_email_health` (~77 tokens)

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.

Input parameters:

- `domain` (string, required): Domain name to score (e.g. example.com)

### `check_health` (~17 tokens)

Check ARC-Relay service health and uptime.

### `check_spf` (~51 tokens)

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

Input parameters:

- `domain` (string, required): Domain name to validate (e.g. example.com)

### `network_leaderboard` (~59 tokens)

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

Input parameters:

- `limit` (number): Max results (1-100, default 25)
- `region` (string): Filter by region (e.g. us-west, eu-central)

### `network_stats` (~31 tokens)

Get public relay network statistics — total nodes, active nodes, messages routed, delivery rate, DMARC pass rate.

## Diagnostics

Captured diagnostic sections: TLS, DNSSEC, Authorisation, Transports. The full working is on the page: https://verifymcp.io/servers/com-arc-relay-mcp/arc-relay#diagnostics

## Score history

- 2026-10-01: 82
- 2026-09-30: 82
- 2026-09-29: 82
- 2026-09-28: 82
- 2026-09-27: 82
- 2026-09-26: 81
- 2026-09-25: 81
- 2026-09-24: 80
- 2026-09-23: 80
- 2026-09-22: 79
- 2026-09-21: 79
- 2026-09-20: 79
- 2026-09-19: 78
- 2026-09-18: 78
- 2026-09-17: 77
- 2026-09-16: 77
- 2026-09-15: 76
- 2026-09-14: 77
- 2026-09-13: 76
- 2026-09-12: 76
- 2026-09-11: 75
- 2026-09-10: 75
- 2026-09-09: 74
- 2026-09-08: 74
- 2026-09-07: 73
- 2026-09-06: 73
- 2026-09-05: 73
- 2026-09-04: 72
- 2026-09-03: 72
- 2026-09-02: 71

## Common questions

### What is the ARC-Relay MCP server?

ARC-Relay is an MCP server listed in the public MCP registry as com.arc-relay/mcp. DMARC-safe email forwarding for agents: aliases, DNS health checks, and MCP tools on your domains. This page covers its hosted endpoint (https://arc-relay.com/mcp).

### Is the ARC-Relay MCP server safe to use?

ARC-Relay scores 82 out of 100 on VerifyMCP. That is a record of what we were able to check automatically, not an endorsement. The category breakdown on this page shows every signal behind the number, including the ones we could not confirm.

### What tools does the ARC-Relay MCP server expose?

ARC-Relay exposes 6 tools: check_dmarc, check_email_health, check_health, check_spf, network_leaderboard, network_stats. Their descriptions and schemas cost roughly 283 tokens of context every time the server is loaded.

### Does the ARC-Relay MCP server require authentication?

No. We connected to ARC-Relay without credentials and it answered, so anything it exposes is reachable by anyone who knows the address.

### Is the ARC-Relay MCP server still maintained?

ARC-Relay is still listed as active in the MCP registry. We last reached this channel on 1 October 2026. Those dates come from our own scans of the registry and the channel itself, not from anything the publisher announced.

## Links

- Remote endpoint: https://arc-relay.com/mcp
- Authorisation metadata: https://arc-relay.com/.well-known/oauth-protected-resource/mcp
- Website: https://www.arc-relay.com/
- Changelog RSS feed: https://verifymcp.io/servers/com-arc-relay-mcp/arc-relay.xml
- Changelog JSON feed: https://verifymcp.io/servers/com-arc-relay-mcp/arc-relay.json
- HTML version of this page: https://verifymcp.io/servers/com-arc-relay-mcp/arc-relay