Email Spam Tester

emaildeliverabilityspamdmarcdkim

Email deliverability testing for agents. Four tools: get a disposable test address, wait for the report once the message arrives, read it, and fetch the raw source. The report has 42 checks (SPF, DKIM, DMARC, 21 blocklists, two spam engines, Gmail and Yahoo bulk sender rules), each linked to its RFC, plus a fix plan. Remote endpoint, no API key.

Quick Install

Automated & IDE Setup

Copy the AI prompt to install this server into Claude Code, Cursor, or another agent — or use 1-click editor setup below.

Add to Cursor Add to VS Code

Also available as a hosted endpoint

Clients with native remote MCP support can connect directly to this URL instead of the install method above.

Remote endpoint

https://email-spam-tester.com/mcp

Manual Client & Custom JSON ConfigExpand JSON ▾

Client Config & Setup

Remote HTTP

Choose your client or environment

Target File:~/Library/Application Support/Claude/claude_desktop_config.json

claude_desktop_config.json

{
  "mcpServers": {
    "email-spam-tester": {
      "url": "https://email-spam-tester.com/mcp"
    }
  }
}

💡 Paste the JSON block into your client's configuration file under mcpServers, then restart the application.

Documentation Overview

Email Spam Tester MCP server

Email Spam Tester is a free, independent email deliverability testing tool built by Serhii Tanichev. This repository is the client side of its MCP server: how to connect an agent to it, what the four tools do, and how to read what they return. There is nothing to install on a server; the MCP endpoint is hosted with the tool.

Site: https://email-spam-tester.com/
Agent guide: https://email-spam-tester.com/skill/
API and examples: https://github.com/serg-tanichev/email-spam-tester

The service exposes an MCP server at https://email-spam-tester.com/mcp over streamable HTTP. No key, no account. Four tools:

Tool	What it does
`get_test_address(lang="en")`	Reserves a disposable address and returns it with the slug and the report URL. `lang` decides the language of the fix plan a person sees on the report page.
`wait_for_report(slug, timeout_seconds=150)`	Blocks until the analysis is done and returns a summary: scores, the failing and warning checks with their evidence, the fix plan. Nothing to poll and no sleep loop to get wrong.
`get_report(slug)`	Reads an existing report without waiting.
`get_message_source(slug)`	The message as delivered: headers in wire order, both bodies, the raw source.

The agent's job in between is to send a real message to the address, from the platform that will send the campaign. Half the checks read headers the sending platform adds, so a copy sent from a laptop says little about it.

Claude Desktop

Add the server to claude_desktop_config.json (see claude-desktop.json for the whole file):

config.json

{
  "mcpServers": {
    "email-spam-tester": {
      "url": "https://email-spam-tester.com/mcp"
    }
  }
}

Clients that do not speak streamable HTTP directly can bridge it with mcp-remote:

config.json

{
  "mcpServers": {
    "email-spam-tester": {
      "command": "npx",
      "args": ["-y", "mcp-remote", "https://email-spam-tester.com/mcp"]
    }
  }
}

Claude Code

Terminal

claude mcp add --transport http email-spam-tester https://email-spam-tester.com/mcp

Reading what comes back

The per-check lines the tools return are in English whatever lang was set to; lang decides what the person opening the report URL sees.
A check status of skip is not a pass: the check did not apply. error means it could not run and is left out of the score.
complete: false means something could not be checked. Treat the score as optimistic until it is true.
The slug is the capability: whoever holds it can read the report, including the subject, the sender, the bounce address and the full source. Do not test somebody else's mail without asking.

The same instructions, written for an agent to read before it starts, are in SKILL.md, and in the project repository serg-tanichev/email-spam-tester.

Where it is listed

MCP Registry, the official one, as io.github.serg-tanichev/email-spam-tester
Smithery
Glama

Files

claude-desktop.json: a complete Claude Desktop configuration with the server added.
server.json: the manifest in the MCP registry format, for registries and directories that read one.

License

MIT, see LICENSE. The license covers this repository, not the service.

Read the full README →View source on GitHub →

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Frequently Asked Questions about Email Spam Tester

Email Spam Tester is a hosted MCP server. Add it as a remote server in your client's config: "mcpServers": { "email-spam-tester": { "url": "https://email-spam-tester.com/mcp" } }

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CategoryCommunication

PricingFree

72Quality signal: Great · 72/100How this signal is calculated ▾

Server availability25/25

Verified ownership20/20

Documentation & tools25/30

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Documentation Overview

Email Spam Tester MCP server

Site: https://email-spam-tester.com/
Agent guide: https://email-spam-tester.com/skill/
API and examples: https://github.com/serg-tanichev/email-spam-tester

The service exposes an MCP server at https://email-spam-tester.com/mcp over streamable HTTP. No key, no account. Four tools:

Tool	What it does
`get_test_address(lang="en")`	Reserves a disposable address and returns it with the slug and the report URL. `lang` decides the language of the fix plan a person sees on the report page.
`wait_for_report(slug, timeout_seconds=150)`	Blocks until the analysis is done and returns a summary: scores, the failing and warning checks with their evidence, the fix plan. Nothing to poll and no sleep loop to get wrong.
`get_report(slug)`	Reads an existing report without waiting.
`get_message_source(slug)`	The message as delivered: headers in wire order, both bodies, the raw source.

Claude Desktop

Add the server to claude_desktop_config.json (see claude-desktop.json for the whole file):

config.json

{
  "mcpServers": {
    "email-spam-tester": {
      "url": "https://email-spam-tester.com/mcp"
    }
  }
}

Clients that do not speak streamable HTTP directly can bridge it with mcp-remote:

config.json

{
  "mcpServers": {
    "email-spam-tester": {
      "command": "npx",
      "args": ["-y", "mcp-remote", "https://email-spam-tester.com/mcp"]
    }
  }
}

Claude Code

Terminal

claude mcp add --transport http email-spam-tester https://email-spam-tester.com/mcp

Reading what comes back

The per-check lines the tools return are in English whatever lang was set to; lang decides what the person opening the report URL sees.
A check status of skip is not a pass: the check did not apply. error means it could not run and is left out of the score.
complete: false means something could not be checked. Treat the score as optimistic until it is true.
The slug is the capability: whoever holds it can read the report, including the subject, the sender, the bounce address and the full source. Do not test somebody else's mail without asking.

The same instructions, written for an agent to read before it starts, are in SKILL.md, and in the project repository serg-tanichev/email-spam-tester.

Where it is listed

MCP Registry, the official one, as io.github.serg-tanichev/email-spam-tester
Smithery
Glama

Files

claude-desktop.json: a complete Claude Desktop configuration with the server added.
server.json: the manifest in the MCP registry format, for registries and directories that read one.

License

MIT, see LICENSE. The license covers this repository, not the service.

Frequently Asked Questions about Email Spam Tester

Email Spam Tester is a hosted MCP server. Add it as a remote server in your client's config: "mcpServers": { "email-spam-tester": { "url": "https://email-spam-tester.com/mcp" } }