#!/usr/bin/python
#-*-coding: utf-8 -*-
from email.MIMEText import MIMEText
import smtplib
import sys
sender = 'test@domain.local' # От кого
recivers = 'test2@domain.local' # Кому
text = sys.argv[1]
msg = MIMEText(text, "", "utf-8")
msg["Subject"] = "Уведомление о пропущенном вызове"
smtpObj = smtplib.SMTP('ex.domain.ru', 25)
smtpObj.ehlo()
smtpObj.starttls()
smtpObj.login('test', '!Q2w3e4r-2015')
smtpObj.sendmail(sender, recivers, msg.as_string())
smtpObj.close()

[root@pbx-o ~]# python /usr/local/bin/sendmail.py qweqweq
Traceback (most recent call last):
  File "/usr/local/bin/sendmail.py", line 21, in <module>
    smtpObj.login('test', '!Q2w3e4r-2015')
  File "/usr/lib64/python2.7/smtplib.py", line 584, in login
    raise SMTPException("SMTP AUTH extension not supported by server.")
smtplib.SMTPException: SMTP AUTH extension not supported by server.