Send the mail your app owes people.

import { Pigeon } from "pigeon";

const pigeon = new Pigeon(process.env.PIGEON_API_KEY, {
  baseUrl: "https://pigeonfs.com"
});

const email = await pigeon.emails.send({
  from: "Ada <ada@yourdomain.com>",
  to: ["person@example.com"],
  subject: "Reset your password",
  html: "<p>Choose a new password.</p>"
});

The same call exists in Python, Go, Java, Rust, Elixir, and over SMTP when the app already speaks it.