[issue33099] test_poplib hangs with the changes done in PR

[Jay Yin]

New submission from Jay Yin <jayyin11043 at gmail.com>:

my test hangs locally on my computer with the changes I've done in bpo-32642 but doesn't hang on TravisCI, anyone able to help with checking what's wrong here (sounds like another edge case with my env but I could be wrong)

the trace for the command https://pastebin.com/q4FKnPZH

----------
components: Tests
messages: 314064
nosy: jayyin11043
priority: normal
severity: normal
status: open
title: test_poplib hangs with the changes done in PR
versions: Python 3.7, Python 3.8

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue33099>
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