ietf-nntp Raw 8bit in subject header

[minibbjd at gmx.de]

Hi,

this is my first post on this list, so please let me know if this is 
off-topic here.

I didn't find anything in the current draft about this, at least 
nothing exact, so could anyone let me know if usefor allows or 
tolerates the use of raw 8 bit in the subject header under special 
circumstances.

Should a follow-up agent try to fix the encoding of a message that 
uses raw 8-bit or should it keep the subject as it is. 
Posting raw 8-bit seems technically wrong, but seems to be the 
correct thing to ensure that all clients can thread the message 
correctly. While the references header shows the link, the changed 
subject makes some clients think that this should be displayed as a 
new thread.

Apart from posting raw 8 bit or not, my understanding is that it's 
generally not a good idea to change the subject header, e.g. to 
change the charset used for inline encoding.

My current approach is to never change the subject line, even if it 
uses raw 8 bit or has an invalid encoding.

Any "official" advise that usefor gives on this?

Thanks,
Marcus