>>> server.connect('smtp.163.com') (220, b'163.com Anti-spam GT for Coremail System (163com[20141201])') >>> server.login('free_eerf@163.com','passwd@163') Traceback (most recent call last): File "<stdin>", line 1, in <module> File "D:\python\Python37\lib\smtplib.py", line 730, in login raise last_exception File "D:\python\Python37\lib\smtplib.py", line 721, in login initial_response_ok=initial_response_ok) File "D:\python\Python37\lib\smtplib.py", line 642, in auth raise SMTPAuthenticationError(code, resp) smtplib.SMTPAuthenticationError: (535, b'Error: authentication failed')