bl_info = {
    "name": "SMS notification after Render",
    "description": "...",
    "author": "--",
    "version": (1, 0),
    "blender": (2, 74, 0),
    "location": "",
    "warning": "",
    "wiki_url": "",
    "category": "Render"}

import bpy
import os
import urllib
import urllib.request
from bpy.app.handlers import persistent

import smtplib
def sendthemailokay():
    sender = 'mymail@hotmail.fr'
    receivers = ['myothermail@laposte.net']

    message = """From: From Person <mymail@hotmail.fr'>
    To: To Person <myothermail@laposte.net>
    Subject: SMTP e-mail test

    This is a test e-mail message.
    """

    try:
       smtpObj = smtplib.SMTP('smtp-mail.outlook.com',25)
       smtpObj.sendmail(sender, receivers, message)
       print ("Successfully sent email")
    except SMTPException:
       print ("Error: unable to send email")

@persistent
def render_complete_handler():
    # The following line has to be changed to match your SMS API protocol
    x = sendthemailokay()

def register():
    bpy.app.handlers.render_complete.append(render_complete_handler)


def unregister():
    bpy.app.handlers.render_complete.remove(render_complete_handler)

if __name__ == "__main__":
    register()