FCC  -  add an address to the FCC field

Usage:  FCC filename

The FCC field contains a filename (or filenames) to receive a copy of
  the outgoing message.  The FCC field is removed during mailing, so 
  readers of your message do not see it.  Use of the field is optional.

If you use the form *filename to put a filename as an address in the TO,
  CC or BCC fields, MM will move the filename to the FCC field.

If the file exists already, the new message is appended to the end.
  The file will be a mail file, readable by MM with the GET command
  (from TOP-LEVEL).  Note carefully, the directory is assumed to be 
  the current working directory (check with the PWD command), and not 
  necessarily the MAIL-DIRECTORY.

The command DISPLAY FCC will show you the current content of the FCC
  field, and ERASE FCC will erase the entire field.  To replace the
  filename, you must ERASE FCC and then give a new FCC command.
  
For more help, type "help" and one of these topics:
  display   to   cc   bcc   erase   header-field   addressing
  set default-fcc-list   set prompt-for-fcc   set saved-messages-file
