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How to Send an Email with smtplib and a Mock Server in Python

Send an email using smtplib and verify it with a local aiosmtpd mock SMTP server — perfect for testing without a real mail server.

smtplib email aiosmtpd

Python

import smtplib
from email.message import EmailMessage
import aiosmtpd.controller as controller
import threading


def handle_message(server, session, envelope):
    print(f"Mock server received message:")
    print(f"From: {envelope.mail_from}")
    print(f"To: {envelope.rcpt_tos}")
    print(f"Subject: {envelope.cont…

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