Send email from Flask over SMTP

Configure Flask-Mail's SMTP settings for Unitpost and send from a verified domain.

1. 1

   Install Flask-Mail

   Shell

   pip install Flask-Mail

2. 2

   Configure and send

   Python

   import os
   from flask import Flask
   from flask_mail import Mail, Message
   
   app = Flask(__name__)
   app.config.update(
       MAIL_SERVER="smtp.unitpost.com",
       MAIL_PORT=587,
       MAIL_USE_TLS=True,
       MAIL_USERNAME="unitpost",
       MAIL_PASSWORD=os.environ["UNITPOST_API_KEY"],
       MAIL_DEFAULT_SENDER="you@yourdomain.com",
   )
   mail = Mail(app)
   
   def send_welcome(to: str) -> None:
       msg = Message("Welcome", recipients=[to], html="<p>Sent via SMTP.</p>")
       mail.send(msg)

3. 3

   Verify delivery

   Check Activity. Bare Python: smtplib.