[issue39384] Email parser creates a message object that can't be flattened as bytes.

[Mark Sapiro]

Mark Sapiro <mark at msapiro.net> added the comment:

Other Mailman3 installations are also encountering this issue. See https://lists.mailman3.org/archives/list/mailman-users@mailman3.org/message/VQZORIDL5PNQ4W33KIMVTFTANSGZD46S/

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue39384>
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