NotImplementedError) found by Neil Norwitz's PyChecker.
# has a hierarchy of classes which implement the backend functionality for the
# smtpd. A number of classes are provided:
#
-# SMTPServer - the base class for the backend. Raises an UnimplementedError
+# SMTPServer - the base class for the backend. Raises NotImplementedError
# if you try to use it.
#
# DebuggingServer - simply prints each message it receives on stdout.
otherwise it returns the desired response string in RFC 821 format.
"""
- raise UnimplementedError
+ raise NotImplementedError
class DebuggingServer(SMTPServer):