Jose-Marcio Martins da Cruz wrote:
I have the feeling that this is part of a larger problem which is how to
inform a border SMTP gateway about caracteristics of final addresses in
internal mail servers.
One example we were talking about is just what are the valid internal
addresses which, with your needs for the consent framework, is a sub
problem of the larger one.
For the problem of checking the validity of internal addresses (e.g.),
there are many solutions, but none of them is perfect.
Maybe this problem could be taken out of your proposal and handled as a
I think you're right, and I actually highlighted this as a "plus" of the
proposal. The ability (in my case for the user) to push some simple
information to the border MTA (in my case, acceptable tokens) so that
messages can be dropped/rejected/accepted earlier, can be very useful
IMHO. In this specific case, messages can be rejected, that otherwise
the final receiver could otherwise only delete from its mailbox.
This should be also what Danny Angus meant in his first message in the
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