SPF is the technology that assures that mail only arrives from authentic
senders. One problem remains that slows down its introduction as a
hard filter, and that is email forwarding. This article nails the
integration of SPF with forwarding.
All our work on identity must somehow end up benefiting applications. One of
most interesting bits of software to do this is a frontend proxy. As so often,
we find a few parts missing to complete our vision of a better-unified Internet.
Although the InternetWide Architecture is building structures to support
advanced modern-day users now and in the far future, the properties of
personal control over online identity can start really modest, with a
simple phone number.