Hi !!
> Indeed, but, as mentioned before, some will argue that if the spf is
> false you have no right to use their resources to verify things as it is
> probably a spam.
this is right if the domain publishes spf, but not if it does not use
spf. Anyway, others could also argue that as the return path must be
valid they have the right to check if it's valid or not before accepting
the message.
--
Best regards ...
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