This is text/plain format=paragraphs - how does reply work?

So we established that viewing flowed text or paragraphs is OK. I don't think 
that's the hard part. I think replying is, as well as viewing replies made in 
the paragraphs format. Replying is also probably just about as important a 
viewing because we do it all the time.  So here's a sample. I'd like to collect 
replies - tell me what your MUA does when replying and how you liked it. I will 
summarize.  BTW, this message is a single long line QP encoded.

LL