Trying to come up with the right place to shim in the CRI control headers.
It seems we can do the following:
1) Use SMTP headers: beyond the deployment issues, CRI is not limited to the
envelope and there are often many mail relays in the path that could remove
such headers. We do not want to restrict mail clients from implementing
CRI.
2) Use RFC 2822 headers: we could possibly introduce a new field altogether
or use an optional field as spec'd in 3.6.8
3) Use MIME headers (registered or private): though CRI has little relavancy
with MIME. Private headers can not become a standard. There isn't such a
limitation on 2822 3.6.8
Thoughts?
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