On Thu, 2020-06-04 at 13:36 +0200, Benoît Panizzon via mailop wrote: > > So I guess using only SPF and DMARC with a reject policy will not work > if the envelope sender and from domain do not align.
Using DMARC p=reject without DKIM is broken anyway. You cannot control how or where your recipients forward their email (and I promise you many of them forward it to Gmail from IP addresses that are not in your SPF record).
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