[exim] dkim fail on forwarded messages

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Lähettäjä: ozzloy
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Vastaanottaja: exim-users
Aihe: [exim] dkim fail on forwarded messages
i'm having trouble with dkim on mail sent to a mailing list that gets
forwarded.

i've posted a description here
https://git.sr.ht/~ozzloy/exim-configuration/tree/master/item/readme.org

if i send an email from an account on my exim server to my gmail, it passes
spf, dkim, dmarc.
https://git.sr.ht/~ozzloy/exim-configuration/tree/master/item/gmail-spf-dkim-dmarc-pass-direct-email.txt

if i send an email to linux-kernel@??? that email gets
forwarded and fails spf and dkim.
https://git.sr.ht/~ozzloy/exim-configuration/tree/master/item/forwarded-email-fails-spf-dkim-google.com%21challenge-bot.com%211654905600%211654991999.xml

i validated my dkim using dkimvalidator.com and the results are here:
https://git.sr.ht/~ozzloy/exim-configuration/tree/master/item/dkimvalidator.com-results.txt

any help would be greatly appreciated. this is for a personal server that
i'm setting up on my own with no prior email server experience.

thanks!