In all the discussion of authenticating individual senders rather than
the servers and MTAs they're using, we've all forgotten that there are
circumstances in which anonymity is a requirement. Think of corporate
whistle-blowing situations, in which someone wishes to send an anonymous
message to an entity like a media organization or the SEC. In a world
in which all transmissions are undeniably authenticated to a sender,
this becomes impossible.
Anonymous transmission is indeed a feature of our current systems, not a
bug. Any new system or authentication layer on top of what already
exists needs to maintain that.
Philip Miller
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