Flask

pip install flask emailssh python-dotenv

# .env. The key comes from https://emails.sh/dashboard/api-keys.
EMAILSSH_API_KEY=esh_your_key_here

# app.py
import os

from dotenv import load_dotenv
from emailssh import Emailssh, EmailsshError
from flask import Flask, jsonify, request

load_dotenv()

app = Flask(__name__)
mail = Emailssh(api_key=os.environ["EMAILSSH_API_KEY"])


@app.post("/signup")
def signup():
    address = (request.json or {}).get("email", "")
    if "@" not in address:
        return jsonify(error="Enter an email address."), 400

    try:
        sent = mail.send(
            from_="Acme <hello@acme.com>",
            to=[address],
            subject="Welcome to Acme",
            html="<p>Confirm your address to finish signing up.</p>",
            text="Confirm your address to finish signing up.",
            idempotency_key=f"signup-{address}",
        )
    except EmailsshError as err:
        # err says what to do about it; the user gets something they can act on.
        app.logger.error("emails.sh refused the send: %s", err)
        return jsonify(error="Could not send the confirmation email."), 502

    return jsonify(id=sent["id"])


if __name__ == "__main__":
    app.run(port=5000)