test script for emails sending

smtp_test.py

#!/usr/bin/env python3

import socket
import sys
from smtplib import SMTP, SMTPAuthenticationError, SMTPException, SMTP_SSL
smtp_address = "smtp-services.example.com"
# smtp_address = "service.smtp.example.com"
smtp_authentication = "login"
smtp_domain = "example.com"
smtp_password = "password"
smtp_port = 465
smtp_username = "username"
test_recipient = "example@example.com"
test_sender = "noreply@example.com"
connection_timeout = 5
communication_timeout = 5

if __name__ == "__main__":
    try:
        try:
            smtp = SMTP_SSL(smtp_address, smtp_port, timeout=connection_timeout)
            print("SMTP server reachable: OK")
        except socket.timeout:
            sys.exit("Connection timeout. Unable to connect to the SMTP server.")
        except Exception as e:
            print(f"An error occurred while trying to reach the SMTP server: {e}")
        with smtp:
            try:
                print(smtp.noop())
                print("Connection to SMTP server: OK")
                smtp.timeout = communication_timeout
                # smtp.starttls() # comment that out if the SMTP server doesn't support starttls
                smtp.login(smtp_username, smtp_password)
                message = (
                    f"From: {test_sender}\n"
                    f"To: {test_recipient}\n"
                    "Subject: SMTP Test Email\n"
                    "\nThis is a test email sent from the SMTP testing script."
                )
                smtp.sendmail(test_sender, test_recipient, message)
                print("Test email sent successfully!")
            except SMTPAuthenticationError:
                print("SMTP authentication error. Please check your username/password.")
            except SMTPException as e:
                print(f"SMTP error occurred: {e}")
                # "Sender address rejected: not owned by user" => incorrect test_sender
                # "Sender address rejected: Domain not found" =>
            except socket.timeout:
                print("Communication timeout.")
    except Exception as e:
        print(f"An error occurred: {e}")