Why _thread doesnt work on the remote server?

This code works on my local server, but doesnt work on the hosting. What could be the problem?

import _thread

def email_index(*args):

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

    server.starttls()

    server.login('ki@gmail.com', 'pas')

    try:

        server.sendmail('ki@gmail.com', 'so@gmail.com', body_mes.encode('utf-8')) print('ok')

     except:

         print('An error occurred when trying to send an email')

try:

    _thread.start_new_thread( email_index, ("Thread-1", 2, ) )

except:

    print ("Error: unable to start thread")

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