[imp] Thread viewing

[Archaic]

I tried to give the demo site a test run, but I guess it is configured
to not send mail? Anyway, I'm looking for a webmail solution and the
most common lack of functionality I've seen is proper listed of threaded
messages. I've only one question about IMP that I haven't yet been able
to answer:

If I have 2 or more messages that are in the same thread, but have
different subjects, and IMP is set to sort on threads, will the messages
with different subjects still be shown in the thread, or as a new
thread?

Thanks for your time!