[issue19770] NNTP: add post_message wrapper to post Email Message objects

[Dong-hee Na]

Change by Dong-hee Na <donghee.na92 at gmail.com>:


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keywords: +patch
pull_requests: +17455
stage: needs patch -> patch review
pull_request: https://github.com/python/cpython/pull/18061

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue19770>
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