Cc:
Carbon copy RFC2822
The Cc: header is
one of a few that specify the list of primary
recipients. The sendmail
program treats the Cc: header no differently from the way
it treats the To:
header. From the user’s point of view, the Cc: header implies that
there are recipients to whom an informational copy
of the message was supplied.
The Cc: header
should never be declared in the
configuration file.
The field for the Cc: header must contain one or more
properly formed addresses, where multiple addresses
must be separated by commas.
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