On Thu 13/Apr/2023 17:21:30 +0200 Barry Leiba wrote:
Anyone who does forwarding is damaged by DMARC because there are a lot of
people who do DMARC on the cheap with SPF only.
This brings up another issue, I think: that there should also be
stronger advice that using DKIM is critical to DMARC reliability, and
using SPF only, without DKIM, is strongly NOT RECOMMENDED.
+1. However, properly used SPF implies extensive whitelisting. It is
relegated to Appendix D in RFC 7208, but it's the only one thing that makes SPF
effective.
Best
Ale
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