[Tutor] Problem with smtplib

[Nikolay Moskvin]

Hi, all
I have a problem with sending mail via smtp. This error does not always 
happen. Does somebody seen this stacktrace?
    smtp.sendmail(send_from, send_to, msg.as_string())
  File "/usr/local/lib/python2.7/smtplib.py", line 725, in sendmail
    (code, resp) = self.data(msg)
  File "/usr/local/lib/python2.7/smtplib.py", line 482, in data
    (code, repl) = self.getreply()
  File "/usr/local/lib/python2.7/smtplib.py", line 352, in getreply
    raise SMTPServerDisconnected("Connection unexpectedly closed")
-- 
Best regards,
Nikolay Moskvin