Mails.ai — Agent Email MCP Server

ai.mails/agent-emailv0.2.12

A real inbox for AI agents: send, receive and thread email, behind a prompt-injection firewall.

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Active5d ago

Install Mails.ai — Agent Email MCP server

claude mcp add mailsai -e MAILS_API_KEY='<mails-api-key>' -- npx -y @mailsai/mcp-server

{
  "mcpServers": {
    "mailsai": {
      "command": "npx",
      "args": [
        "-y",
        "@mailsai/mcp-server"
      ],
      "env": {
        "MAILS_API_KEY": "<mails-api-key>"
      }
    }
  }
}

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

{
  "mcpServers": {
    "mailsai": {
      "command": "npx",
      "args": [
        "-y",
        "@mailsai/mcp-server"
      ],
      "env": {
        "MAILS_API_KEY": "<mails-api-key>"
      }
    }
  }
}

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

{
  "servers": {
    "mailsai": {
      "type": "stdio",
      "command": "npx",
      "args": [
        "-y",
        "@mailsai/mcp-server"
      ],
      "env": {
        "MAILS_API_KEY": "<mails-api-key>"
      }
    }
  }
}

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

{
  "mcpServers": {
    "mailsai": {
      "command": "npx",
      "args": [
        "-y",
        "@mailsai/mcp-server"
      ],
      "env": {
        "MAILS_API_KEY": "<mails-api-key>"
      }
    }
  }
}

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

Configuration

Variable	Required	Secret	Description
MAILS_API_KEY	yes	yes	Your mails.ai API key. Use an mk_test_ key to run against the sandbox or an mk_live_ key to send real mail. Free key at https://mails.ai
MAILS_BASE_URL	—	—	Override the API base URL. Defaults to the hosted mails.ai API; only needed for staging or self-hosted deployments.

Freshness

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

Last commit (default branch)
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Latest release
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Package published
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Registry entry updated
2026-10-04 · 5d ago · official registry · v0.2.12

FAQ

›How do I install the Mails.ai — Agent Email MCP server in Claude Code?

Run: claude mcp add mailsai -e MAILS_API_KEY='<mails-api-key>' -- npx -y @mailsai/mcp-server. For Cursor, VS Code, Claude Desktop and Windsurf, use the install tabs above.

›Does Mails.ai — Agent Email require an API key?

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

›Can I use Mails.ai — Agent Email as a remote (hosted) MCP server?

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

›Is Mails.ai — Agent Email in the official MCP registry?

Yes, as ai.mails/agent-email.