A general broad mailing list whitelist will be problematic, do work it needs to look for specific list type hidden headers, spammers and nasties will incorporate those headers into their trash that impersonates mailing lists and voila, they pass. there is no quick and easy fix to the dmarc mess other than p=none aspf=s (DKIM is another one that gets narky at lists, and despite all the spf haters dreams, I've never had a problem with spf and lists, and we were an early beta adopter of spf)

Kind Regards,

Noel Butler

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