Github user sebbASF commented on the issue:
https://github.com/apache/incubator-ponymail/issues/212
No; there is one 'From ' line which precedes each set of e-mail headers.
Note the trailing space.
However *anything* can appear in message bodies, including lines starting
with 'From '.
In general it's not possible to distinguish such lines from the message
separator, so one technique is to convert 'From ' to '>From ' when writing the
mail bodies in mbox files.
This needs to be reverted when reading the body otherwise the content does
not correspond with the original message.
PM uses the body + lid + date for id generation in the 'medium' algorithm
which is what lists.a.o uses.
So if the message body is corrected by removing the leading '>', the MID
will change.
If it is not corrected, the message is wrong.
Obviously mbox export and import need to agree, otherwise chaos results.
N.B. Escaping 'From ' is more complicated than just prefixing it with '>'.
It has to allow for a body containing: 'From ' and '>From '. But I digress.
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