GitHub user sebbASF opened an issue:
https://github.com/apache/incubator-ponymail/issues/404
Bug: parser cannot handle unexpected text Content-Type.
Some (old) ASF messages [1,2] have unexpected Content-type, for example:
Content-Type: text/$email_type; charset=iso-8859-1
Whilst this is not strictly valid, it's clearly a text message.
At present the message is dropped.
[1]
http://mail-archives.apache.org/mod_mbox/jakarta-general/200301.mbox/%[email protected]%3E
[2]
http://mail-archives.apache.org/mod_mbox/jakarta-general/200301.mbox/%[email protected]%3E
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