What are reliable alternatives to DemiSignal?

Measured by Faceabot as working: Email Auth Checker, InboxGuards Email Check, DnsGuard.

How do I connect an AI agent to DemiSignal?

Use the MCP streamable HTTP endpoint https://demisignal.com/mcp?utm_source=mcp-registry.

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Catalog › com.demisignal/mcp

Is DemiSignal reliable?

Being measured Measurement in progress: 2 check(s) so far. A verdict needs at least 3 checks.

Last check: 2026-10-14 22:00 UTC · answered in 8002 ms · remote (no install)

Proven alternatives that work right now

Email Auth Checker Reliable (measured) · 100%
SPF, DKIM, DMARC, MTA-STS and domain-expiry checks for any domain, with SPF lookup counts. · https://email-auth-check.quietworklabs.workers.dev/mcp

InboxGuards Email Check Reliable (measured) · 100%
Check emails before you send, and get a $1 SPF/DKIM/DMARC fix plan for your domain. Pay per call. · https://api.inboxguardstest.com/mcp

DnsGuard Reliable (measured) · 100%
Check a domain's email authentication: SPF, DKIM, DMARC, BIMI, MX, MTA-STS, TLS-RPT. Score + fixes. · https://dnsguard.mike-tusa.workers.dev/mcp

Picked from Faceabot's live measurements. Or let Faceabot choose: GET https://faceabot.com/resolve?need=…

En français : Mesure en cours. Faceabot teste cet outil lui-même, en continu, sans dépendre de ce que son auteur affirme.

What it does

Check a domain's DMARC, SPF, DKIM, MX, BIMI and MTA-STS records. Generate SPF and DMARC records.

Source: official MCP registry (registry.modelcontextprotocol.io) · version 1.0.0 · publisher website

Connect your agent

{
  "mcpServers": {
    "mcp": {
      "url": "https://demisignal.com/mcp?utm_source=mcp-registry"
    }
  }
}

Or ask Faceabot first: MCP tool check_reliability {"id":"com.demisignal/mcp"} on https://faceabot.com/api/mcp.

Does it actually do the job?

Real task being tested — Faceabot asked check_domain to do a small read-only task 1 time(s): 1 returned a real result, the last 1 in a row. Last result: ok in 3064 ms.

Sample input: {"domain":"example.com"}. A success means a non-empty result without error; it does not certify the accuracy or safety of the content.

Faceabot measurements

When	Answers	Real task	Latency
2026-10-14 22:00 UTC	❌ timeout		8002 ms
2026-10-14 15:30 UTC	✅ ok	✅ done	7251 ms

Method: MCP initialize then tools/list from Faceabot (FaceabotProbe/1.0), plus one read-only tool call with a neutral input when the server declares one, repeated over time. This checks that the server is up and speaks MCP correctly; it does not certify the quality or safety of each tool. How measurement works.

Find tools similar to DemiSignal →

Publisher of DemiSignal?

Show your measured reliability on your README or website:

[![Measured by Faceabot](https://faceabot.com/badge/com.demisignal/mcp.svg)](https://faceabot.com/tools/com.demisignal/mcp)

Data in JSON: /api/catalog?id=com.demisignal/mcp · Stop probes: POST /api/reliability/opt-out

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