Untitled

Traceback (most recent call last):
  File "StackOverflow/multipart_email.py", line 41, in <module>
    main()
  File "StackOverflow/multipart_email.py", line 35, in main
    server.login(input('Username: '), input('Password: '))
  File "Python35libsmtplib.py", line 730, in login
    raise last_exception
  File "Python35libsmtplib.py", line 721, in login
    initial_response_ok=initial_response_ok)
  File "Python35libsmtplib.py", line 627, in auth
    initial_response = (authobject() if initial_response_ok else None)
  File "Python35libsmtplib.py", line 664, in auth_login
    raise SMTPAuthenticationError(code, resp)
smtplib.SMTPAuthenticationError: (502, b'5.5.1 Unrecognized command. r134sm2789857qke.10 - gsmtp')

#! /usr/bin/env python3
import email.mime.multipart
import email.mime.text
import smtplib


def main():
    message = email.mime.multipart.MIMEMultipart('alternative')
    message['From'] = 'Noctis.Skytower@gmail.com'
    message['To'] = 'Stephen.P.Chappell@gmail.com'
    message['Subject'] = 'Multipart Email'
    text = '''
Hi!
How are you?
This is a test for multipart emails.
It is being sent via Python.
https://www.python.org/'''
    html = '''
<html>
    <head>
        <title>Who is going to see this?</title>
    </head>
    <body>
        Hi!<br/>
        How are you?<br/>
        This is a test for multipart emails.<br/>
        It is being sent via <a href="https://www.python.org/">Python</a>.
    </body>
</html>'''
    message.attach(email.mime.text.MIMEText(text, 'plain'))
    message.attach(email.mime.text.MIMEText(html, 'html'))
    server = smtplib.SMTP('smtp-relay.gmail.com', 587)
    server.ehlo()
    server.starttls()
    server.login(input('Username: '), input('Password: '))
    server.sendmail(message['From'], message['To'], message.as_string())
    server.quit()


if __name__ == '__main__':
    main()