[issue29539] [smtplib] collect response data for all recipients

[sls]

sls <sls at mailbox.org> added the comment:

I opened a new PR. 

I picked up some of FirefighterBlu3's suggestions and added some unittests and refactoring to assist. Hope this helps.

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue29539>
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