On Wed 16/Oct/2024 18:00:47 +0200 Dave Crocker via mailop wrote:
[...]
7. The myth that SPF is simple to implement is because it is simple for a
sender to create a basic SPF record. It does not mean that it is simple to
create a more elaborate record, or to ensure that all authorized sending sites
are list. Nor does it mean that it is simple for a receiver to provide
fully-conformant processing.
DKIM is much more difficult. Heritage header adjustments are still encysted in
a number of MTAs, intermittently causing mysterious DKIM failures.
Please consider: If SPF were deprecated, was would be the actual, significant
effects on email anti-abuse processes?
Missing a backup authentication method would make DMARC even less reliable.
Best
Ale
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