When you respond to a message do not change the headers unless you
know what you're doing.  Threaded newsreaders, like trn, tin, and
netscape, use the References header to track threads.  Unthreaded
newsreaders, like rn, nn, and pine use the Subject header to simulate
thread tracking.  If you change either of these headers you will mess
up the tracking abilities of some newsreaders.

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