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Hi there,

I have recently gotten myself into running a usenet server and with that,
I have been mirroring down Linux Kernel mailing lists to have as a rolling
two year archive. As part of that, I have had to figure out what headers
in list-mail is preventing pullnews from pulling the messages of
nntp.lore.kernel.org (as they make the lists available via NNTP somehow).

And with that, there is a reflection on the mail headers I am coming
across that seems to duplicate standard headers. The headers I filter out
can be found at gopher://photonic.trudheim.com/1/usenet/headers.txt though
I will call out a few.

 X-Alt-Message-ID:
 X-CodeTwo-MessageID:
 X-Gmail-Original-Message-ID:
 X-Google-Original-Date:
 X-Google-Original-From:
 X-Google-Original-Message-ID:

I could understand these headers if they used them for something
internally and then stripped them before the mail left their servers, but
that is not the case. They have primarily contained the standard header
data. And some of the (other) headers contain large amounts of encoded
data as well.

FWIW, it would be nice to see email and nntp RFCs harmonise on headers
(colon-space) and make some recommendations on mail systems dropping
headers like spam-filters add when they hand off mail to other
mailservers. Seeing mails that have been spam-scanned multiple times by
different solutions en-route is kind of pointless when spam-scanning is
something the destination likely will do themselves (as everyone have a
differing view on what spam is).

-- 
Kind regards,

/S

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Email headers Sirius <sirius@trudheim.com> - 2024-06-28 11:44 +0200
  Re: Email headers Marco Moock <mm+usenet-es@dorfdsl.de> - 2024-06-28 12:50 +0200
    Re: Email headers Sirius <sirius@trudheim.com> - 2024-06-29 09:19 +0200

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