[issue8739] Update to smtpd.py to RFC 5321

[Giampaolo Rodola']

Giampaolo Rodola' <g.rodola at gmail.com> added the comment:

Re-adapted patch including size_limit change as described in my previous message is in attachment.
Barry and Alberto, could you take a final look at it before committing?

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Added file: http://bugs.python.org/file18546/smtpd.patch

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