Github user sebbASF commented on the issue:
https://github.com/apache/incubator-ponymail/issues/212
https://docs.python.org/3/library/mailbox.html#mbox says:
"... any occurrences of âFrom â at the beginning of a line in a message
body are transformed to â>From â when storing the message, although
occurrences of â>From â are not transformed to âFrom â when reading the
message."
This is rather unfortunate.
It's likely too late to unmangle the lines once the message has been
parsed, as the >From sequence may occur anywhere, including in attachments.
There does not seem to be any way to intercept the file reader used by the
parser, but one can provide a message factory to the parser and it looks as
though one can use that to overload the file read() methods.
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