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What is BCC, LCC, and FCC?

The following content is primarily from the Pine help system:

BCC

The Bcc (Blind Carbon Copy) header is used when you wish to send a copy of the message to one or more people whose addresses you do not wish disclosed, either to reduce clutter or for confidentiality.
 
The format of the Bcc: field is just the same as the To: and Cc: fields in the way the addresses are entered.  The recipients listed here will receive a copy of the message, but --assuming your site's mail transport software is properly configured-- their addresses will not show up in the headers of the message, as delivered to all of the recipients.  The To: and Cc:  recipients will not know a copy was sent to the Bcc: recipients.
 
Note: if there is no To: or Cc: or Lcc: address in the message, Pine will automatically generate and place in the To: field a pseudo-address of  "Undisclosed recipients: ;" or whatever string has been specified in the "empty-header-message" variable.
 
The reason for this is to avoid embarrassment caused by some Internet mail transfer software that interprets a "missing" To: header as an error and replaces it with an Apparently-to: header that may contain the addresses you entered on the Bcc: line.  In addition, it may be less disconcerting to Bcc: recipients to see *something* in the To: field.
 
You can manipulate what text ends up on the (originally) empty To: field.  Just remember to put a colon and semicolon at the end of the field, which is a special notation denoting that it is not a real address.

FCC

The Fcc (File Carbon Copy) specifies the folder used to keep a copy of each outgoing message.  The default value can be configured with the "default-fcc" and "fcc-name-rule" options.  You can change or remove the file carbon copy on any message you send by editing the Fcc header.
 
You may type ^T to get a list of all your folders and select one to use as the Fcc for this message.

LCC

The Lcc (List Carbon Copy) header is intended to be used when you wish to send a message to a list of people but avoid having all of their addresses visible, in order to reduce clutter when the message is received.
 
It is similar to the Bcc (Blind Carbon Copy) header in that individual addressees are hidden, but Lcc is designed to work specifically with distribution lists you have created in your Pine Address Book.  Placing the nickname of the list on the Lcc line will result in the full name of your Pine Address Book list being placed on the To: line of the message, using a special notation that distinguishes it from a real address. You must leave the To: line blank for your list name to appear there.
 
For example, if you have this list entered in your Address Book:
 
        largo         Key Largo List       DISTRIBUTION LIST:
                                           bogie@mgm.com
                                           lauren@mgm.com
                                           walter@mgm.com
 
And you enter "largo" on the Lcc: line while composing a message, the result is:
 
        To      : Key Largo List: ;
        Cc      :
        Bcc     :
        Fcc     : sent-mail
        Lcc     : Key Largo List <bogie@mgm.com>,
                  lauren@mgm.com,
                  walter@mgm.com
        Subject :
 
Each recipient listed on the Lcc: line receives a copy of the message without their address being visible (as though they were listed on the Bcc: line). The colon-semicolon notation used to put the full-name of the list on the To: line is a special address format that doesn't specify any actual addressees, but does give some information to the recipients of the message.

Note: if after entering an Lcc, you delete the list name that is placed on the To: line, then recipients will see To: Undisclosed recipients: ; (or whatever string is defined in the empty-header-message variable) just as in the Bcc case.

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