Address Type
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... per-recipient-fields. MIXER also defines a
new NOTARY address type "x400", with encoding of EBNF.std-or. A
directory name may be inluded as an RFC 822std11(-> 2822prop) ...
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ORCPT
If the address type of the original recipient is "x400" or
"rfc822", this may be used at the MTS level, to generate an
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