3028bis open issue #2: unknown envelope-part names

The behavior of the 'envelope' test does not appear to be defined
for envelope-parts other than 'from' and 'to', ala:
        envelope "cc" "bob(_at_)example(_dot_)com"

Should that be a required error, required to be silently ignored,
or implementation defined?

(The only opinion other than my own that I've heard on this felt
that it should be a required error, so if no one speaks up, that's
the way it'll go.)


Philip Guenther