Nathaniel writes...
If you have control of an enclave, you can make sure
that data with a transfer-encoding of "quoted-binary" never leaves it,
right? So you can define your own local c-t-e ("x-quoted-binary"?) and
make sure your gateway never lets such data out.
...
What I would suggest is that if someone gets this working in
a gateway, then an RFC documenting and standardizing the "quoted-binary"
usage would be a trivial amount of followup effort. I'd just like to
see at least one gateway come first!
If a view of this from the 8bit transport side of things is helpful...
Hear! Hear!
The only thing I would add is that there is clearly other interest in
8bit transport of near-binary data floating around the SMTP Ex WG,
interest that has been suppressed in the interests of getting some base
materials emitted from that group. If I wanted to pursue this question
in the near term, I'd make a brief posting to that list to try to
organize a private discussion among interested parties with an eye
toward producing a single coherent proposal that some WG could have a
look at (subscription requests to
ietf-smtp-request(_at_)dimacs(_dot_)rutgers(_dot_)edu).
--john