maybe you could tell me why my script stops

[komarek]

i m so sorry guys... i made a copy from linux terminal and copied bad... i update the post

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this is actually the code

#!/usr/bin/env python3
import os
import paho.mqtt.publish as publish
import paho.mqtt.client as mqtt
import time
import smtplib
import requests
from datetime import datetime

def inviamail(sogg, dest, testo):
fromaddr = '[email protected]'
toaddrs  = dest
msg = testo
sub = sogg
username = '[email protected]'
password = 'xxxxx'
server = smtplib.SMTP('smtp.gmail.com:587')
server.ehlo()
server.starttls()
server.login(username,password)
message = 'Subject: {}\n\n{}'.format(sub, msg)
server.sendmail(fromaddr, toaddrs, message)
server.quit()
return

while True:
def on_connect(client, userdata, flags, rc):
#print("Connected with result code "+str(rc))
client.subscribe("cancello")

def on_message(client, userdata, msg):
messaggio = str(msg.payload)
if "APERTO" in messaggio:
t = datetime.now().time()
tempo = str(t)[0:8]
print(tempo+" - ACCESSO")
inviamail("Cancello Aperto", "[email protected]", "Appena aperto il cancello\nalle ore " + tempo)
client.disconnect()

client = mqtt.Client()
client.on_connect = on_connect
client.on_message = on_message

client.connect("127.0.0.1",1883,60)

client.loop_forever()

the code works fine
but once in a day or 2 it breaks with the error i wrote

thanks

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try to replace it with

       server = smtplib.SMTP('smtp.gmail.com', 587)

i've changed this line.. the script still works... let's see if it gonna break again.thanks

bytheway: if i want to run the script in background at startup in my raspberry how do you suggest me to do that?
shall i write down some error management in the script?