Message 381607 - Python tracker

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Content 
I'm importing some mbox archives into my maildirs, and use `mailbox.mbox` to parse archives created by pipermail.

Some of these archives seem to contain non-ascii characters, and python just throws a `UnicodeDecodeError` and refuses to process the archive.

Reproducer: (successful on 3.7.9, 3.8.5, 3.9.0)

```
curl https://lists.freedesktop.org/archives/systemd-devel/2016-January.txt.gz | zcat > mbox.txt
python3 -c "import mailbox; mb = mailbox.mbox('mbox.txt');mb.items()"
```