DomainRef - domain and email security check vs Email Auth Checker
DomainRef - domain and email security check is an MCP server published by domainref.dev. Marketplaces we read that list it: 1 (Official MCP Registry). Email Auth Checker is an MCP server published by email-auth-check.quietworklabs.workers.dev. Marketplaces we read that list it: 1 (Official MCP Registry). As of our marketplace pass on 2026-10-28. This pair was picked by a reader, not by our comparison rule, so search engines are asked not to index the page.
Where each is published
| Marketplace |  DomainRef - domain and email security check | |
|---|---|---|
| Official MCP Registry | Listed Version: 1.0.0 No figure published Not marked · First seen |
Listed Version: 1.0.0 No figure published Not marked · First seen |
Each figure is the marketplace's own and is never added up across marketplaces. A marketplace that publishes no figure shows none: no number is not zero.
The facts side by side
| Fact | DomainRef - domain and email security check | Email Auth Checker |
|---|---|---|
| Marketplaces that list it | 1 | 1 |
| Last release | Not published | Not published |
| Where it runs (differs) | Remote server (domainref.dev/mcp) | Remote server (email-auth-check.quietworklabs.workers.dev/mcp) |
| Transport | Streamable HTTP | Streamable HTTP |
| Tools it declares | Not published | Not published |
| Environment variables it asks for | Not published | Not published |
| Licence | Not stated | Not stated |
| Repository | Not stated | Not stated |
| Changes in the last 7 days | 0 | 0 |
| First seen (differs) | 2026-10-20 | 2026-10-18 |
| Endpoint at the last check (differs) | Responded 2 days ago | Responded 4 days ago |
Lines where the two differ have a tinted background and bold values. Where the data itself says which value is better (more marketplaces, a larger figure of the same marketplace, a fresher release, a verified mark on a marketplace that lists both), the better one is also marked green with ▲ and the worse one red with ▼. Where it runs, the transport, the tools, the settings, hooks, the bundle's parts, the licence and the week's changes are marked only as different: more or fewer is not better in itself.
What each says it does
DomainRef - domain and email security check
Pay-per-call domain and email security check: SPF, DKIM, DMARC, TLS, DNSSEC, BIMI, with exact fixes.
Email Auth Checker
SPF, DKIM, DMARC, MTA-STS and domain-expiry checks for any domain, with SPF lookup counts.
How to run each
DomainRef - domain and email security check As a remote MCP server
claude mcp add --transport http domainref https://domainref.dev/mcp --header "X-API-Key: <YOUR_X_API_KEY>"Requires: X-API-Key header
Email Auth Checker As a remote MCP server
claude mcp add --transport http email-auth-check https://email-auth-check.quietworklabs.workers.dev/mcpCommands built only from what the marketplaces declare; the full set for every client is on each card.
Both endpoints responded at the last daily check. How we check endpoints
Tools each declares
Neither one's marketplaces publish a list of tools, so there is nothing to compare.
Settings each asks for
Neither one's marketplaces publish the settings it asks for.
What it can do: DomainRef - domain and email security check · What it can do: Email Auth Checker · Compare two other plugins
Data comes from the Official MCP Registry (registry.modelcontextprotocol.io), CC0 1.0. Figures come from our own regular passes over the marketplaces, last read on . We publish no contact details for plugin publishers.