Mails.ai — Agent Email MCP Server

by mails Your server? Claim it

answering

Mails.ai — Agent Email is answering right now. Last checked 9 min ago. 502 installs a week from npm.

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

Installs per day peak 432 · avg 50 · -11% w/w

a month agotoday

Uptime history 6 days of history

6 days agonow

100.0%

Uptime 24h

92 of 92 checks

—

Tools

hidden behind auth

321 ms

Response time

average over 24h

502

Installs / week

npm and PyPI

Nothing serious here today

Today is the operative word: we check Mails.ai — Agent Email every 15 minutes and re-read its code on every release. Watch it and you find out the day that stops being true.

Connect this server

Endpoint below is the one we actually reach during checks — not the one copied from a README. Last verified 9 min ago.

Claude Code Claude Desktop Codex Cursor VS Code

run in your terminal

claude mcp add agent-email --transport http https://api.mails.ai/mcp

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

{
  "mcpServers": {
    "agent-email": {
      "url": "https://api.mails.ai/mcp"
    }
  }
}

~/.codex/config.toml

[mcp_servers.agent-email]
url = "https://api.mails.ai/mcp"

.cursor/mcp.json

{
  "mcpServers": {
    "agent-email": {
      "url": "https://api.mails.ai/mcp"
    }
  }
}

.vscode/mcp.json

{
  "mcpServers": {
    "agent-email": {
      "url": "https://api.mails.ai/mcp"
    }
  }
}

This one needs environment variables set before it will start: MAILS_API_KEY (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.). The author declared them in the registry entry; get the values from the project itself.

This endpoint answered with an authorization challenge. The server is running, and it signs you in through your browser: there is no API key to paste.

Endpoints

URL	Transport	State	Latency	Checked
https://api.mails.ai/mcp	streamable-http	sign-in	272 ms	9 min ago

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Mails.ai — Agent Email — questions

Answers built from our own checks of this server.

Why is there no tool list for Mails.ai — Agent Email?

The server answered our handshake with an authorization challenge, so it is running — but it will not describe its tools to an anonymous client. To see them you need to connect with your own credentials. We record it as alive, not as broken: 100.0% of checks in the last 24 hours got a reply.

Is Mails.ai — Agent Email working right now?

We send a real MCP handshake every 15 minutes. Over the last 24 hours 92 of 92 checks got a reply (100.0%), average response time 321 ms. The bar chart above shows every period we have measured.

How do I connect Mails.ai — Agent Email?

Copy the ready config from this page — we generate it for Claude Code, Claude Desktop, Codex, Cursor and VS Code, each with the file path that client actually reads. It is a remote server, so there is nothing to install — the client connects to the address. You sign in through your browser once and the client keeps the session: no key to copy, and it refuses anonymous clients.

How do you sign in to Mails.ai — Agent Email?

No API key is involved. Mails.ai — Agent Email answers our knock with an OAuth challenge, so you authorise it once in your browser and the client keeps the session. That is also why we see no tool list: it will not describe itself to an anonymous client, and that is the server working as intended, not a fault.

How fast is Mails.ai — Agent Email?

It answers our handshake in 321 ms on average, which is faster than 42% of all working MCP servers we measure. The comparison comes from our own checks across the whole registry, every 15 minutes.

How many people use Mails.ai — Agent Email?

The npm package @mailsai/mcp-server was installed 502 times in the last week. Week over week that is -11%. We show installs rather than GitHub stars on purpose: a star is a bookmark, an install is someone actually running it.