From: Dave Crocker [mailto:dhc(_at_)dcrocker(_dot_)net]
An inter-MTA protocol has to be able to accept email from a total
stranger,
that's a policy directive, not a technical requirement.
Just to hammer this home, the language was "be able to".
That's a technical requirement.
The ability to exchange mail, without prior arrangement, is
fundamental to Internet mail. That a receiver might invoke
policies to the contrary is entirely their right. But the
basis for the design choices of the standards is quite clear.
I would go a bit further. The technical infrastructure has to provide
support for the policy infrastructure.
I am getting a bit fed up of people in the Identity 2.0 world stating
'that's just the user interface'. If you design a federated user
authentication scheme you have to deal with users, deal with it.
If you are developing a mail system you have to deal with the unsolicited
message. Saying 'that's policy' is effectively saying 'I am not solving the
real problem'.
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