Chapter 13 ■ SMtp

257

Listing 13-6. Authenticating over SMTP

#!/usr/bin/env python3

Foundations of Python Network Programming, Third Edition

https://github.com/brandon-rhodes/fopnp/blob/m/py3/chapter13/login.py

import sys, smtplib, socket
from getpass import getpass

message_template = """To: {}
From: {}
Subject: Test Message from simple.py

Hello,

This is a test message sent to you from the login.py program
in Foundations of Python Network Programming.
"""

def main():
if len(sys.argv) < 4:
name = sys.argv[0]
print("Syntax: {} server fromaddr toaddr [toaddr...]".format(name))
sys.exit(2)

server, fromaddr, toaddrs = sys.argv[1], sys.argv[2], sys.argv[3:]
message = message_template.format(', '.join(toaddrs), fromaddr)

username = input("Enter username: ")
password = getpass("Enter password: ")

try:
connection = smtplib.SMTP(server)
try:
connection.login(username, password)
except smtplib.SMTPException as e:
print("Authentication failed:", e)
sys.exit(1)
connection.sendmail(fromaddr, toaddrs, message)
except (socket.gaierror, socket.error, socket.herror,
smtplib.SMTPException) as e:
print("Your message may not have been sent!")
print(e)
sys.exit(1)
else:
s = '' if len(toaddrs) == 1 else 's'
print("Message sent to {} recipient{}".format(len(toaddrs), s))
connection.quit()

if name == 'main':
main()