MCP Server

Mails.ai — Agent Email MCP Server

io.github.RolloutsAI/mails-agent-email

Registry

What is the Mails.ai — Agent Email MCP server?

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

How to install Mails.ai — Agent Email

Copy-paste configuration for popular MCP clients.

transport: stdio

Config generated by PluginBench — verify against the source before use.

Environment / auth

MAILS_API_KEY
required
secret
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.

~/Library/Application Support/Claude/claude_desktop_config.json

{
  "mcpServers": {
    "mails-agent-email": {
      "command": "npx",
      "args": [
        "-y",
        "@mailsai/mcp-server"
      ],
      "env": {
        "MAILS_API_KEY": "<YOUR_MAILS_API_KEY>",
        "MAILS_BASE_URL": "<YOUR_MAILS_BASE_URL>"
      }
    }
  }
}