I just found out about SPF, so please forgive me if this question has
already been asked and answered. (I did read the FAQ, and didn't find it
there).
This proposal seems to entail a lot of complexity and work for a result
that is admittedly not 100% effective and will also inconvenience many
end users. There's a much simpler way to verify senders: S/MIME or GPG
signatures. Either or both schemes are already implemented on many
mailers, though they aren't used much. Why not just put your collective
weight behind getting them used?
With message signatures, no kludgey changes to the DNS or to mail
servers are required. All the work can be done at the end points, and
the choice whether to accept or ignore a certain message is under
recipient control where it belongs. And I can continue to send my email
direct to its recipients from any IP address I happen to be visiting.
Phil
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