When using smtplib.SMTP to connect to a SMTP server the instance variables esmtp_response survives a SMTP.quit() which results in the following error:>>> import smtplib>>> smtp = smtplib.SMTP('mail.oberkirch.org', 25)>>> smtp.starttls()(220, b'2.0.0 Ready to start TLS')>>> smtp.ehlo()(250, b'mail.oberkirch.org\nPIPELINING\nSIZE 10240000\nVRFY\nETRN\nAUTH PLAIN LOGIN\nAUTH=PLAIN LOGIN\nENHANCEDSTATUSCODES\n8BITMIME\nDSN')>>> smtp.quit()(221, b'2.0.0 Bye')>>> smtp.connect('mail.oberkirch.org', 25)(220, b'mail.oberkirch.org ESMTP Postfix')>>> smtp.starttls()Traceback (most recent call last):  File "<stdin>", line 1, in <module>  File "/usr/lib/python3.4/smtplib.py", line 672, in starttls    raise SMTPException("STARTTLS extension not supported by server.")smtplib.SMTPException: STARTTLS extension not supported by server.>>>While reporting this issue I found out that starttls also does not throw away any ehlo information as it should. Provided that fixing this would probably break existing code (which would only work with non-standard servers like postfix) I did not change that behaviour.

Thanks, Milan.I could swear I typed a '6' in the commit message, but apparently not...New changeseta058760cb069 by R David Murray in branch '3.4':#22215: have the smtplib 'quit' command reset the state.http://hg.python.org/cpython/rev/a058760cb069New changesetd0d4ab0ba70e by R David Murray in branch 'default':Merge#22215: have the smtplib 'quit' command reset the state.http://hg.python.org/cpython/rev/d0d4ab0ba70eNew changeset7288519594de by R David Murray in branch '2.7':#22215: have the smtplib 'quit' command reset the state.http://hg.python.org/cpython/rev/7288519594de