Two bug fixes for problems reported by Sverre:
Two bug fixes for problems reported by Sverre:

__getaddr(): Watch out for empty addresses that can happen when
something like "MAIL FROM:<CR>" is received.  This avoids the
IndexError and rightly returns an SMTP syntax error.

parseargs(): We didn't handle the 2-arg case where both the localspec
and the remotespec were provided on the command line.

sk-/python2.7-type-annotator,sk-/python2.7-type-annotator,sk-/python2.7-type-annotator