Envoi d'emails en python

#!/usr/bin/python3


HEURE_ENVOI="07:00"
FICHIER_DONNEES="temp.txt"
PASSWORD="ton_pwd"
SENDER="ton_mail@gmail.com"
RECEIVER="mail1@yahoo.fr,mail2@axiomeconcept.com,mail3@gmail.com"

from email.mime.multipart import MIMEMultipart
from email.mime.text import MIMEText
import smtplib
import time #Tempo

def envoyerMail(mensaje):
    # create message object instance
    msg = MIMEMultipart()

    message = mensaje

    # setup the parameters of the message
    password = PASSWORD
    msg['From'] = SENDER
    msg['To'] = RECEIVER
    msg['Subject'] = "TEST ENVOI MAIL"

    # add in the message body
    msg.attach(MIMEText(message, 'plain'))
    print ("A")
    #create server
    server = smtplib.SMTP("smtp.gmail.com",587)
    print ("B create server smtplib.SMTP")
    server.starttls()

    # Login Credentials for sending the mail
    server.login(msg['From'], password)


    # send the message via the server.
    server.sendmail(msg['From'], msg['To'].split(","), msg.as_string())

    server.quit()

    print ("successfully sent email to %s:" % (msg['To']))

def main():

    print ("Emailer")
    while True:

        if str( time.strftime("%H:%M"))==HEURE_ENVOI:
            print ("Envoi messages ",HEURE_ENVOI)
            message=""
            fichier= open(FICHIER_DONNEES, 'r')
            for ligne in fichier:
                message += ligne
            fichier.close()
            envoyerMail(message)

            time.sleep(61)

        time.sleep(10)


if __name__ == "__main__":
    main()