Github user sebbASF commented on the issue:
https://github.com/apache/incubator-ponymail/issues/288
The message uses some invalid characters in the boundary: "<" and ">".
Experimentation shows that the Python parser does not like the ">".
The boundary in the message is:
Content-Type: multipart/mixed; boundary="<<001-3e1dcd5a-119e>>"
Further tests show that the parser strips off the outer <> when extracting
the boundary, so it's not surprising that the parts are not detected. That does
seem like a bug, as the parser handles other invalid chars OK.
A simple work-round would be to treat the entire body as text.
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