Am 29.08.2016 um 15:49 schrieb project722:
What about DKIM only? Can it be used instead of, or, as a "replacement" for SPF? For example mails are signed with DKIM from the SMTP servers, and the receiving servers are checking both SPF and DKIM. If the receiving server detected a missing SPF would it allow mail through if DKIM is present and valid? I suppose a lot of this depends on the SPF policies enforced on the receiving side
anything - not only a lot - depends on the policies of the receiver and is different for every single destination server
in case of a spf-policyd there is no point to look at DKIM because SPF is running long before smtp data and so a "-all" SPF_FAIL would reject the message long before any headers containg DKIM are received at all
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