GitHub user sebbASF opened an issue:
https://github.com/apache/incubator-ponymail/issues/403
Bug: archiver adds a Message-Id to mails if they don't have one
The archiver unconditionally adds a Message-Id header to any messages that
don't have one.
This is generated from the archived-at header, which is itself generated
from the current time if it does not exist.
Adding the header changes the source message which does not seem right.
The id will not be present in any other archives that have the message.
It's also a poor message id as it has no random element
The importer also adds the header, however it does not set the archived-at
header so the generated id is always the same for a given list.
The Message-ID value does not have the conventional format so at least it
can readily be detected.
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