smtpd.SMTPChannel contains a bug such that when connected to an SMTPServer (or any subclass thereof), issuing a MAIL command with no argument closes the socket and gives this error on the server:
error: uncaptured python exception, closing channel <smtpd.SMTPChannelconnected 127.0.0.1:58587 at 0x847d8> (<type 'exceptions.TypeError'>:'NoneType' object is unsubscriptable [/System/Library/Frameworks/Python.framework/Versions/2.5/lib/python2.5/asyncore.py|read|68] [/System/Library/Frameworks/Python.framework/Versions/2.5/lib/python2.5/asyncore.py|handle_read_event|390] [/System/Library/Frameworks/Python.framework/Versions/2.5/lib/python2.5/asynchat.py|handle_read|137] [/System/Library/Frameworks/Python.framework/Versions/2.5/lib/python2.5/smtpd.py|found_terminator|158] [/System/Library/Frameworks/Python.framework/Versions/2.5/lib/python2.5/smtpd.py|smtp_MAIL|224] [/System/Library/Frameworks/Python.framework/Versions/2.5/lib/python2.5/smtpd.py|__getaddr|212]) The desired result is of course is to respond with a 501 Syntax error. The problem arises because the arg parameter passed to each smtp_* command handler function is None when there is no argument. arg is passed on to __getaddr which attempts a slice on the None object. I think the most elegant solution would be to insert a "if not arg" check in __getaddr and return. The existing smtp_MAIL code will then issue the 501 Syntax error. -Derek Shockey
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