Python raw SMTP ()unauthenticated)

pySmtpSend.py

#!/usr/bin/python
import smtplib
import os

SMTP_SERVER = os.getenv('SMTP_SERVER', 'localhost')
SMTP_PORT = os.getenv('SMTP_PORT', '25')
SENDER_EMAIL_ADDR = os.getenv('SENDER_EMAIL_ADDR', '[email protected]')
SENDER_NAME = os.getenv('SENDER_NAME', 'NO-REPLY')
RECEIVER_EMAIL_ADDR = os.getenv('RECEIVER_EMAIL_ADDR', 'root@localhost')
RECEIVER_NAME = os.getenv('RECEIVER_NAME', 'Root')
MESSAGE = os.getenv('MESSAGE', 'Test  Message')
SUBJECT = os.getenv('SUBJECT', 'This is a test  message')

sender = SENDER_EMAIL_ADDR
receivers = [RECEIVER_EMAIL_ADDR, ]

message = """From: {} <{}>
To: {} <{}>
Subject: {}

{}
""".format(
  SENDER_NAME,
  SENDER_EMAIL_ADDR,
  RECEIVER_NAME,
  RECEIVER_EMAIL_ADDR,
  SUBJECT,
  MESSAGE
)

try:
   smtpObj = smtplib.SMTP(SMTP_SERVER, int(SMTP_PORT))
   smtpObj.sendmail(sender, receivers, message)         
   print "Successfully sent email"
except SMTPException:
   print "Error: unable to send email"