connection keep closing

[yellowkid21]

Name The File Path (For Password List) => /home/kali/hack-gmail/rockyou.txt
Traceback (most recent call last):
File "hack-gmail.py", line 44, in
smtpserver.login(user, password)
File "/usr/lib/python3.8/smtplib.py", line 723, in login
(code, resp) = self.auth(
File "/usr/lib/python3.8/smtplib.py", line 635, in auth
(code, resp) = self.docmd("AUTH", mechanism + " " + response)
File "/usr/lib/python3.8/smtplib.py", line 425, in docmd
return self.getreply()
File "/usr/lib/python3.8/smtplib.py", line 398, in getreply
raise SMTPServerDisconnected("Connection unexpectedly closed")
smtplib.SMTPServerDisconnected: Connection unexpectedly closed