Hi,
in section 5.5.1, Publish an SPF Policy for an Aligned Domain, the last
sentence says:
The SPF record SHOULD be constructed
at a minimum to ensure an SPF pass verdict for all known sources of
mail for the RFC5321.MailFrom domain.
As we learnt, an SPF pass verdict has to be granted to /trusted/ sources
only. An additional phrase about using the neutral qualifier ("?") for
public sources might also be added.
Best
Ale
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