OID value: 1.3.26.0.4406.0.2.11
OID description:
This service enables the originating to
indicate to the recipient the names of one or more
recipients, as well as the category (primary or copy)
in which they are placed, that are intended to receive
or have received the message via other means.
See also the OID Repository website reference for 1.3.26.0.4406.0.2.11