From: jkorpela@cs.tut.fi 
  
 ezelsdorf  wrote: 
  
 > 2.2.5.  References 
 - - 
 > What does that mean exactly? Am I allowed to change the subject or 
 > not? 
  
 You are. You may, and indeed should, change the Subject line if it 
 clearly does not correspond to the topic of the discussion (assuming, 
 of course, that you wish to continue the thread). 
  
 > The thing is that on Google groups the threads seem be broken 
 > after the subject has been changed. 
  
 Google Groups is broken. It even groups messages together by the 
 Subject line alone. 
  
 > In my understanding of the RFC 
 > the subject must not be changed 
  
 No, the point there is that _user agents_ (newsreaders) should have a 
 followup-to command that constructs a Subject line in a particular way. 
 The user may then decide to change that line. 
  
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