Thanks for hi-jacking my thread. :P
Your MUA, like many/most, does something behind your back when you use "Reply"
instead of "New Message". In particular it has headers like these:
References: <201008111208.16247.bss@iguanasuicide.net>
In-Reply-To: <201008111208.16247.bss@iguanasuicide.net>
Changing the subject line does NOT start a new thread when you use the "Reply"
feature, because of these headers.
http://en.wikipedia.org/wiki/User

onDiego/Thread_hijacking
--
Boyd Stephen Smith Jr. ,= ,-_-. =.
bss@iguanasuicide.net ((_/)o o(\_))
ICQ: 514984 YM/AIM: DaTwinkDaddy `-'(. .)`-'
http://iguanasuicide.net/ \_/