Github user sebbASF commented on the issue:
https://github.com/apache/incubator-ponymail/issues/265
Note that the Source version [2] of the message is also mangled in
lists.a.o; it includes other odd characters (not the replacement char).
I tried parsing the input using
msg = email.message_from_bytes(sys.stdin.buffer.read())
instead of
input_stream = io.TextIOWrapper(sys.stdin.buffer, encoding='utf-8',
errors="ignore")
msgstring = input_stream.read()
msg = email.message_from_string(msgstring)
That fixes the display problem, however the source message then uses Base64
encoding for the body, which is not ideal as it cannot be read directly. It
looks like the source problem is caused by using message.as_string() to
re-create the source from the parsed mail. That may be to do with the original
having been 8-bit.
[2]
https://lists.apache.org/api/source.lua/52ecda6f7b859fa9cdd4d9fb64d6f7a3b54f29f971e5536e844d9150@%3Cdev.johnzon.apache.org%3E
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