Mark Sapiro <[email protected]> added the comment:
I've researched this further, and I know how this happens. The original message
contains a text/html part (in my case, the only part) which contains a base64
or quoted-printable body which when decoded contains non-ascii. It is parsed
correctly by email.message_from_bytes.
It is then processed by Mailman's content filtering which retrieves html
payload via
part.get_payload(decode=True).decode(ctype, errors='replace'))
where part is the text/html part and ctype is 'utf-8' in this case. It then
uses elinks, lynx or some other configured command to convert the html payload
to plain text and that plain text still contains non-ascii.
It then replaces the payload and sets the content type via
del part['content-transfer-encoding']
part.set_payload(plain_text)
part.set_type('text/plain')
And this results in a message which can't be flattened as_bytes.
The issue is set_payload() should encode the payload appropriately and in fact,
it does if an appropriate charset is given, so this is our error in not
providing a charset= argument to set_payload.
Closing this and the corresponding PR.
----------
stage: patch review -> resolved
status: open -> closed
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Python tracker <[email protected]>
<https://bugs.python.org/issue39384>
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