Mark Alley via mailop skrev den 2023-06-20 19:05:
You'll need to add the DKIM selector (and key) Sophos generated for
you to your external DNS provider so that other receivers can resolve
the key, which enables them to validate messages signed by your email
filter.
if sophos like to change custommers dns, then sophos is loosing
all that is required for another forward host is to ARC-Sign/ARC-Seal
before breaking dkim if valid dkim cant be preserved otherwize
or start another way, do ATPS signing, if sophos is pro that should not
be a problem
proff is this maillist here breaks dkim, so mailop also fails
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