Looks like this will be a tricky charter to get agreement on. I happen to
think this is a very important effort. I suggest the following structure
to "do it the IETF way" and to try to get concensus:
Focus on writing a simple, extensible language for final delivery time
filtering (MTA -> mailstore interface). While other uses for this could
be nice, this is the one which needs client/server interoperability in the
IMAP context.
Have three deliverables:
* A model document which describes how final delivery filtering fits in
the Internet mail architecture, and includes requirements for
transferring the script from the client to the final delivery agent.
* A MIME type for the Sieve language
* At least one proposed transport mechanism to pass the MIME type securely
from the client to the final delivery agent.
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I don't see how an IETF WG could get away with designing a payload (e.g.,
the Sieve language) without also identifying at least one way to carry
that payload.
- Chris