> It indeed does not stop spam, it does (partially) stop faking your
> source email domain, which could partially stop virus spreads, but that
> would require that a large (>75%) of the global is using it. No check
> somewhere -> does not work.

SPF will only work for scoring, but not for rejecting e-mails.

it's like IPv6 - you cannot expect the whole internet and all domain admins
to really put SPF in place - so you'll have around 15% of domains which are
using SPF and the rest is not using it or even aware of it (implify
everywhere ~all).

-steven

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