python - How to making the smtlib.SMTP synchronous functions -


i newbie python programming. writing small smtp client testing postfix smtp server implementation. have used python smtplib same. here code snippet. 

import smtplib def smtptest(serverstr, mode=1): servername = serverstr   server = smtplib.smtp(servername, 25) try:   server.set_debuglevel(true)   server.ehlo()   # if can encrypt session,   if server.has_extn('starttls'):     server.docmd('starttls\r\n rset')  finally:   print "closing smtp session ...."   server.quit() if __name__ == "__main__":     print "closing session ..." smtptest(<ip address of smtp server>, 1)`

i using docmd() should smtp server response. trying check smtp server behavior command 'starttls\r\n rset'.

response details:- expectation smtp server, if vulnerable, should give 2 response codes in sequence. 1 starttls , other rset commands. observation server gets ready tls tunnel , code enters in block close session. conclusion server not vulnerable starttls.

my query:- if reverse command string 'rset\r\n starttls', 2 response codes. reverse string of resetting , starting tls, quit function call ends session , command display starttls appears after client sends quit command. wanted synchronize call of quit after complete response server. in case, first being rset , starttls. pointers of great help.


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