GitHub user sebbASF opened an issue:
https://github.com/apache/incubator-ponymail/issues/412
Bug: use actual envelope header if present
The From_ line is currently generated by mbox.lua from the Return-Path and
Received headers.
This is not always accurate.
The method msg.as_bytes() can include the original envelope header as used
in the From_ line.
This should only be done if the envelope is present, as otherwise a default
is added which changes the source. Also the default is not as good as the one
generated by mbox.lua.
Since existing messages won't have the From_ line, mbox.lua needs to check
if the From_ line needs to be added or not. This also affects From_ prefixing
as the code currently assumes the buffer does not contain the From_ header
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