LocalFree

dead-letter MCP server

BigCactusLabs/dead-letter

Convert .eml exports to Markdown with YAML front matter for RAG pipelines: thread splitting, signature stripping, attachment extraction and calendar parsing.

8 GitHub stars
Source code

Install dead-letter in Claude Code

PyPI (uv)

Claude Code
claude mcp add dead-letter -- uvx dead-letter
mcp.json (Claude Desktop, Cursor, VS Code, Windsurf)
{
  "mcpServers": {
    "dead-letter": {
      "command": "uvx",
      "args": [
        "dead-letter"
      ]
    }
  }
}

MCP Bundle (.mcpb)

Claude Code
curl -LO https://github.com/BigCactusLabs/dead-letter/releases/download/v0.4.10/dead-letter-mcp-0.4.10.mcpb
mcp.json (Claude Desktop, Cursor, VS Code, Windsurf)
Download dead-letter-mcp-0.4.10.mcpb and double-click it to install in Claude Desktop.

MCP Bundles install in one click in Claude Desktop. Download the file, then open it.

Docker

Claude Code
claude mcp add dead-letter -- docker run -i --rm ghcr.io/bigcactuslabs/dead-letter@sha256:08699fa81fd5be51b12cdbcbbcdd4333f8a2dd9d928d79ca1b9e34473beac8af
mcp.json (Claude Desktop, Cursor, VS Code, Windsurf)
{
  "mcpServers": {
    "dead-letter": {
      "command": "docker",
      "args": [
        "run",
        "-i",
        "--rm",
        "ghcr.io/bigcactuslabs/dead-letter@sha256:08699fa81fd5be51b12cdbcbbcdd4333f8a2dd9d928d79ca1b9e34473beac8af"
      ]
    }
  }
}

Frequently asked questions

What does the dead-letter MCP server do?

Convert .eml exports to Markdown with YAML front matter for RAG pipelines: thread splitting, signature stripping, attachment extraction and calendar parsing.

Is the dead-letter MCP server free?

Yes, most likely. Open source and no paid account or API key is mentioned in the listing. Check the provider for current pricing.

Does dead-letter run locally or remotely?

Local. Runs on your machine (stdio). You install it with npx, uvx, Docker or from source.

How do I add dead-letter to Claude Code?

Run: claude mcp add dead-letter -- uvx dead-letter

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