MailFlat MCP Server

by mailflatio.github.MailFlat/mailflat-mcpv0.9.2

Email inboxes for agents that return one-time codes as a field. Addresses are permanent; messages expire after a configurable retention window.

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Active5d ago

Install MailFlat MCP server

claude mcp add mailflat -e MAILFLAT_API_KEY='<mailflat-api-key>' -- uvx mailflat-mcp

{
  "mcpServers": {
    "mailflat": {
      "command": "uvx",
      "args": [
        "mailflat-mcp"
      ],
      "env": {
        "MAILFLAT_API_KEY": "<mailflat-api-key>"
      }
    }
  }
}

Add to ~/.cursor/mcp.json (global) or .cursor/mcp.json (project).

{
  "mcpServers": {
    "mailflat": {
      "command": "uvx",
      "args": [
        "mailflat-mcp"
      ],
      "env": {
        "MAILFLAT_API_KEY": "<mailflat-api-key>"
      }
    }
  }
}

Settings → Developer → Edit Config (claude_desktop_config.json), then restart.

{
  "servers": {
    "mailflat": {
      "type": "stdio",
      "command": "uvx",
      "args": [
        "mailflat-mcp"
      ],
      "env": {
        "MAILFLAT_API_KEY": "<mailflat-api-key>"
      }
    }
  }
}

Add to .vscode/mcp.json in your workspace.

{
  "mcpServers": {
    "mailflat": {
      "command": "uvx",
      "args": [
        "mailflat-mcp"
      ],
      "env": {
        "MAILFLAT_API_KEY": "<mailflat-api-key>"
      }
    }
  }
}

Add to ~/.codeium/windsurf/mcp_config.json.

Configuration

Variable	Required	Secret	Description
MAILFLAT_API_KEY	yes	yes	MailFlat API key. Create one in the dashboard under Agents.
MAILFLAT_API_URL	—	—	Override the API base URL. Defaults to https://mailflat.net.

Freshness

Active — last maintenance signal 5d ago. The newest of the signals below sets the band.

Last commit (default branch)
2026-10-05 · 5d ago · GitHub
Latest release
2026-09-29 · 11d ago · GitHub · v0.7.0
Package published
no data · npm/PyPI
Registry entry updated
2026-08-27 · 44d ago · official registry · v0.9.2

FAQ

›How do I install the MailFlat MCP server in Claude Code?

Run: claude mcp add mailflat -e MAILFLAT_API_KEY='<mailflat-api-key>' -- uvx mailflat-mcp. For Cursor, VS Code, Claude Desktop and Windsurf, use the install tabs above.

›Does MailFlat require an API key?

Yes. It expects MAILFLAT_API_KEY, of which 1 is a secret.

›Can I use MailFlat as a remote (hosted) MCP server?

No hosted endpoint is published; it runs locally over stdio.

›Is MailFlat in the official MCP registry?

Yes, as io.github.MailFlat/mailflat-mcp.