> Actually, this  kind of behaviour  is called  a "design choice".  You can
> make a case  for doing it one way,  and you can make a case  for doing it
> the  other way  ("Hey, I  never put  NO SUBJECT  in my  message!") I  was
> waiting to see how many people agreed/disagreed.

My understanding of what people want SubjectHdr for is to make messages
from a list more recognizable.  Given that, I think that creating a
subject header with just the Subject-Tag text is the best thing to do
when there is no Subject header in the message.