MCP server

SpamFixer Email Deliverability Check Official

com.spamfixer/email-deliverability-check

Checked 28 Oct 2026, 09:03 UTC · Connected to it and listed its tools

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

Website

At a glance

Type

MCP server

Publisher

spamfixer.com (verified by the MCP Registry)

Status

Working at last check

Tools

1

Token cost

About 237 tokens per request

Sets up in

Claude Code, Claude Desktop, Codex, Gemini CLI, Cursor, VS Code, Antigravity, ChatGPT, OpenAI API, Grok

Last checked

28 Oct 2026, 09:03 UTC

Connect it to your agent

Add to CursorAdd to VS CodeVS Code Insiders

Opens the app, which shows the server and asks you to confirm. For other apps, copy the setup below.

Claude Code

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

Claude Desktop

Settings → Connectors → Add custom connector, and paste the URL.

Codex (config.toml)

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

Gemini CLI

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

Cursor

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

VS Code

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

Antigravity

agy mcp add email-deliverability-check https://spamfixer.com/mcp

ChatGPT

Settings → Apps & Connectors → Advanced settings: turn on Developer mode, then Create a connector and paste the URL. Which plans can do this varies.

OpenAI API (Responses tools)

{"type":"mcp","server_label":"email-deliverability-check","server_url":"https://spamfixer.com/mcp","require_approval":"always"}

Grok (xAI API tools)

{"type":"mcp","server_label":"email-deliverability-check","server_url":"https://spamfixer.com/mcp"}

Tools

• check_email_deliverability Sends messages · ~237 tokens
  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 key

Browse

• Domains and DNS
• Email

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