[issue8739] Update to smtpd.py to RFC 5321

[R. David Murray]

R. David Murray <rdmurray at bitdance.com> added the comment:

Yes, the fact that there are no unit tests for the new functionality.  As far as I can see the existing smtpd tests (which don't appear to be too extensive...but this module probably dates from before we had a firm unit test policy), are in test_smtplib.

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