SpamFixer Email Deliverability Check MCP Server

by spamfixer Your server? Claim it

answering

SpamFixer Email Deliverability Check is answering right now. Last checked 15 min ago. It exposes 1 tools.

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

Uptime history 5 days of history

5 days agonow

100.0%

Uptime 24h

91 of 91 checks

Tools

read from the server

622 ms

Response time

average over 24h

open, no key

Access

streamable-http

Nothing serious here today

Today is the operative word: we check SpamFixer Email Deliverability Check every 15 minutes and re-read its code on every release. Watch it and you find out the day that stops being true.

Connect this server

Endpoint below is the one we actually reach during checks — not the one copied from a README. Last verified 15 min ago.

Claude Code Claude Desktop Codex Cursor VS Code

run in your terminal

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

Settings → Connectors → Add custom connector, then paste this address

https://spamfixer.com/mcp

~/.codex/config.toml

[mcp_servers.email-deliverability-check]
url = "https://spamfixer.com/mcp"

.cursor/mcp.json

{
  "mcpServers": {
    "email-deliverability-check": {
      "url": "https://spamfixer.com/mcp"
    }
  }
}

.vscode/mcp.json

{
  "servers": {
    "email-deliverability-check": {
      "type": "http",
      "url": "https://spamfixer.com/mcp"
    }
  }
}

Available tools 1

Read directly from the server with tools/list, grouped by what they act on. If a tool disappears, we record the date.

check_email_deliverability

Check why emails from a domain might land in spam. Looks up the domain's public DNS: SPF, DKIM (common selectors), DMARC, MX, and whether its mail servers are on major blocklists. Returns a 0-100 score and plain-English issues, worst first. Read-only: it changes nothing and sends no email. DKIM keys on custom selectors can't be found from outside, so "DKIM not found" is only a hint. Free email providers (gmail.com etc.) aren't checked. Args: domain: The domain that sends the email, e.g. "joesplumbing.com". A website URL or an email address also works; the domain is taken from it.

Endpoints

URL	Transport	State	Latency	Checked
https://spamfixer.com/mcp	streamable-http	answering	644 ms	15 min ago

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SpamFixer Email Deliverability Check — questions

Answers built from our own checks of this server.

What can SpamFixer Email Deliverability Check do?

It exposes 1 tools, read directly from the server on our last check. Among them: check_email_deliverability. The full list with descriptions is on this page — we take it from the server itself via tools/list, not from a README. How MCP servers expose tools in the first place →

Is SpamFixer Email Deliverability Check working right now?

We send a real MCP handshake every 15 minutes. Over the last 24 hours 91 of 91 checks got a reply (100.0%), average response time 622 ms. The bar chart above shows every period we have measured.

How do I connect SpamFixer Email Deliverability Check?

Copy the ready config from this page. We generate it for Claude Code, Claude Desktop, Codex, Cursor and VS Code, each in the form that client actually reads. It is a remote server, so there is nothing to install — the client connects to the address.

Does SpamFixer Email Deliverability Check need an API key?

No. SpamFixer Email Deliverability Check completed a full MCP handshake with us as an anonymous client and listed its tools without asking for anything. All 1 of them are readable on this page. This is what we observed, not what the docs claim.

How fast is SpamFixer Email Deliverability Check?

It answers our handshake in 622 ms on average, which is faster than 17% of all working MCP servers we measure. That is on the slow side — worth knowing if the tool sits inside an interactive loop. The comparison comes from our own checks across the whole registry, every 15 minutes.