sc: What Supercite Does Not Do

 
 1.2 What Supercite Doesn’t Do
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 Because of this clear division of labor, there are useful features which
 are the sole responsibility of the MUA, even though it might seem that
 Supercite should provide them.  For example, many people would like to
 be able to yank (and cite) only a portion of the original message.
 Since Supercite only modifies the text it finds in the reply buffer as
 set up by the MUA, it is the MUA’s responsibility to do partial yanking.
 SeeReply Buffer Initialization.
 
    Another potentially useful thing would be for Supercite to set up the
 outgoing mail headers with information it gleans from the reply buffer.
 But by previously agreed upon convention, any text above the
 ‘mail-header-separator’ which separates mail headers from message bodies
 cannot be modified by Supercite.  Supercite, in fact, doesn’t know
 anything about the meaning of these headers, and never ventures outside
 the designated region.  SeeHints to MUA Authors, for more details.