[issue8489] Support RFC 6531 in smptlib

[R. David Murray]

Changes by R. David Murray <rdmurray at bitdance.com>:


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resolution:  -> duplicate
stage: needs patch -> resolved
status: open -> closed
superseder:  -> RFC 6531 (SMTPUTF8) support in smtplib
versions: +Python 3.5 -Python 3.4

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<http://bugs.python.org/issue8489>
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