QAmcp

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Directory / ARC-Relay Email

ARC-Relay Email

Q: Is ARC-Relay Email MCP server safe?

QAmcp's test on 2 Nov 2026: None of the hidden-instruction wordings we know were found in its tool descriptions. Its error messages showed no secrets or internal details. All 6 of its tools are labeled read-only. Overall it scored 91/100 on 2 Nov 2026. A test can only see what the server shows from outside, not what it does with your data behind the scenes. Connect servers from makers you trust.

by arc-relay.com · https://arc-relay.com/mcp

Checks any domain's DMARC, SPF, MX and DKIM setup, scores it 0-100, and ranks the fixes.

6 tools✓ all read-only✓ no account neededPricing: on their site

See pricing →Visit website

91 /100

PASS · WITH NOTES

12 of 12 checks · 2 Nov 2026

Is ARC-Relay Email MCP server safe?

None of the hidden-instruction wordings we know were found in its tool descriptions.
Its error messages showed no secrets or internal details.
All 6 of its tools are labeled read-only.
Overall it scored 91/100 on 2 Nov 2026.

A test can only see what the server shows from outside, not what it does with your data behind the scenes. Connect servers from makers you trust.

What it can do

6 tools, in the server's own words.

check_dmarcread-only

Check a domain's DMARC, SPF, and MX records.

check_email_healthread-only

Get a 0-100 email health score for any domain.

check_healthread-only

Check ARC-Relay service health and uptime.

check_spfread-only

Validate a domain's SPF record.

network_leaderboardread-only

View top relay nodes ranked by reputation score.

network_statsread-only

Get public relay network statistics — total nodes, active nodes, messages routed, delivery rate, and the average DMARC rate nodes report about themselves (rate…

Test results

Safe mode: only tools labeled read-only were run. How the test works

!
Bad inputs give a clean error
4 warnings
- !check_dmarc: Accepted wrong type for "domain" without complaining
- !check_email_health: Accepted wrong type for "domain" without complaining
- !check_spf: Accepted wrong type for "domain" without complaining
- !network_leaderboard: Accepted wrong type for "region" without complaining
- and 3 more
note
!
Follows MCP best practices (not scored yet)
1 tip (not scored)
- !6 tools answer with structured data but don't declare its shape (outputSchema): check_dmarc, check_email_health, check_health, check_spf, network_leaderboard, network_stats. If those answers change shape, nothing can catch it; with a schema
note
!
Resources and prompts work
3 warnings (6 resources)
- !Listing resource templates failed: Error POSTing to endpoint: {"jsonrpc":"2.0","id":16,"error":{"code":-32601,"message":"Method not found: resources/templates/list"}}
- !1 of 6 resources have no description, so people can't tell what they contain.
- !skill://arc-relay-domain-setup/SKILL.md: The content contains "don't tell the user". If an AI reads this, it may follow it. Check where this text comes from.
- and 2 more
note
✓
ConnectsConnected in 469 ms
pass
✓
Ready for the newest MCP versionUses the latest MCP version (2026-07-28)
pass
✓
Lists its toolsFound 6 tools
pass
✓
Every tool is describedAll 6 tools and their inputs are described
pass
✓
Tools are labeled safe or dangerousEvery tool has a safety label
pass
✓
No known hidden instructionsNone of the hidden-instruction wordings we know were found in tool descriptions. New wordings can get past this check.
pass
✓
Tools work with good inputs
All good
- ✓check_dmarc: Worked (128 ms)
- ✓check_email_health: Worked (342 ms)
- ✓check_health: Worked (128 ms)
- ✓check_spf: Worked (128 ms)
- ✓network_leaderboard: Worked (186 ms)
- ✓network_stats: Worked (203 ms)
pass
✓
Fast enough
All good
- ✓Connecting took 469 ms
- ✓Listing tools took 142 ms
- ✓Average tool answer: 186 ms
- ✓check_email_health: Slowest tool: check_email_health (342 ms)
pass
✓
No secrets leakedChecked 3 error messages: no secrets or internal details
pass
–
Tools work togetherNo tool's answer could be fed into another tool, so there were no chains to test (not counted either way)
not tested

Test it yourself

Free and open source. Same checks, same score.

npx qamcp-cli https://arc-relay.com/mcp

Show this score on GitHub

Free for every server in the directory. Paste this into your README: the badge shows the score from our latest test.

[![QAmcp score](https://qamcp.dev/s/com-arc-relay-mcp.svg)](https://qamcp.dev/s/com-arc-relay-mcp.html)

Score over time

2 Nov 202691

One test so far. New tests will show here.

Reviews

Coming soon: reviews from people who use ARC-Relay Email, signed in with GitHub, one per person. Reviews never change the score.

Is this your server? Get an alert the moment it breaks.

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