Send Email from a Node.js AI Agent

fetch() is enough

const res = await fetch("https://api.mails.ai/v1/messages", {
  method: "POST",
  headers: {
    Authorization: `Bearer ${process.env.MAILS_API_KEY}`,
    "Content-Type": "application/json",
  },
  body: JSON.stringify({
    agent: "hello",
    to: "user@example.com",
    subject: "Welcome aboard",
    body_text: "Thanks for signing up — reply any time and I will read it.",
  }),
});

Prefer types? npm install @mailsai/sdk gives you the same calls with autocomplete; running an MCP-capable runtime instead of raw Node, use @mailsai/mcp-server and your agent gets send/read as tools with zero glue code.

An address the agent actually owns

Create an agent once and it keeps its address, its thread history, and its sender reputation — no shared From: pool, no borrowed human mailbox. Inbound mail is parsed and injection-scanned before your handler sees it. The free tier covers 3,000 emails and 3,000 inbound replies a month; Pro is $20 a month for 50,000 emails and 50,000 inbound replies.