Hm, It seems I have misread it xDThis however changes circumstances then, including lists.archlinux.org is NOT a good idea...
I say, if you do not want to get DMARC reports, then change the report option in your DMARC report to only send a report if both SPF and DKIM fail.
Otherwise, just accept the fact that the mailing list by design with fail spf, thus always ensure your emails are signed by a dkim signature so that you won't get spammed (hopefully).
As for getting spammed by google with dkim valid, I assume this is google spamming less known email servers, because they are a**holes!
Thanks for the help, Polarian
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