GitHub user sebbASF opened an issue:
https://github.com/apache/incubator-ponymail/issues/234
Bug: import/archive don't unfold headers before storage in ES
The mail parser returns the headers as-is, including line-wraps.
This is what is wanted for the raw email source, but is not really suitable
for fields such as In-Reply-To, References etc.
It seems there is no unfold method in the Python email or mailbox modules,
so it looks like it is necessary to write one.
Header values that have not been folded cannot contain CRLF, so unfolding
should just be a matter of stripping these out. There should be no need to
check if the CRLF is followed by whitespace (assuming the folding has been done
correctly).
It might make sense to compress runs of WS to a single space in case there
is some variation.
This should make it easier to match things like In-Reply-To.
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