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.
Give a technician a hammer, and soon she'll see nails everywhere.
Why use other tools, if a hammer works so well?
This is pretty much the position that HTTP is in, and this is far
from well-deserved. A healthy Internet requires a plethora of protocols,
all optimised for their particular purposes.