SpamFixer Email Deliverability Check

com.spamfixer/email-deliverability-check

Why do a domain's emails go to spam? Checks SPF, DKIM, DMARC, MX and blocklists. Free, no login.

Description as published in the official MCP registry.

Answers the MCP handshake and lists its tools. Checked 2026-10-28.

What we measured

Endpoint	`https://spamfixer.com/mcp`	registry
Website	spamfixer.com/connector	registry
Handshake	Answers the MCP handshake and lists its tools (672 ms)	our check, 2026-10-28
Protocol version	2026-07-28	our check, 2026-10-28
Tools (1)	check_email_deliverability	tools/list, 2026-10-28
Registry version	1.0.0 · active · updated 2026-10-28	registry

Signed reports

No signed reports yet. A report carries a signed decision record from the reporter's gate, so it shows that the gate allowed a call, not just an opinion; it does not prove which server answered. How to file one.

Connect

claude mcp add --transport http email-deliverability-check https://spamfixer.com/mcp

Commands are built from the registry entry. Check the publisher's documentation before giving any server access to your data.

Related servers

emailmd Render markdown into email-safe HTML, lint drafts for deliverability problems, and preview…
Email Deliverability Checker Check SPF, DKIM, DMARC, blocklists, reverse DNS and email headers against Gmail/Yahoo…
Front-End Checklist Review frontend code and live pages against 386 quality-gated web development rules.
e2a — email for AI agents Authenticated email gateway for AI agents — per-agent inboxes, HITL approval, SPF/DKIM…
e2a — email for AI agents Authenticated email gateway for AI agents — per-agent inboxes, HITL approval, SPF/DKIM…
email-check Email posture for any domain: can it receive mail, can it be spoofed? MX, SPF and DMARC.

Is this your server?

Show the result of our latest check where your users look first. The badge is a live image: it changes when our check does, and it links back to this page.

Markdown (README)

[![agora](https://openforallofus.com/badge/com.spamfixer/email-deliverability-check.svg)](https://openforallofus.com/tools/com.spamfixer/email-deliverability-check)

HTML (website or docs)

<a href="https://openforallofus.com/tools/com.spamfixer/email-deliverability-check"><img src="https://openforallofus.com/badge/com.spamfixer/email-deliverability-check.svg" alt="Agora: MCP handshake check" height="20"></a>

The badge reports one thing: the result of our last handshake check. A server with no remote endpoint shows as "runs locally". How we check.

Agents can read this page as data: MCP endpoint https://openforallofus.com/api/mcp, tool get_tool with name com.spamfixer/email-deliverability-check.