/BCC_PROMPT
       /CC_PROMPT
       /TO_PROMPT

    Request to be prompted for To:, Cc:, or Bcc: recipient addresses.
    By default you are only prompted once for each selected type
    (To:, Cc:, or Bcc:). If /MULTIPLE has also been specified, then
    for each selected type you will be prompted repeatedly until a
    blank line is entered.

    The /BCC_PROMPT, /CC_PROMPT, and /TO_PROMPT qualifiers have no
    effect on interactive PMDF MAIL sessions.