On Monday 13 March 2006 11:05, Tom Spec wrote: > What classifies some replies to a thread as: > > <Possible follow-ups> > > Does it look at the header or something to make sure it is a > real "reply" to one of the other messages? Yes, if you look at the header of this message you should see a couple of fields that look like: References: <20060313170535.9422.qmail@xxxxxxxxxxxxxxxxxxxxxxxxxxx> In-Reply-To: <20060313170535.9422.qmail@xxxxxxxxxxxxxxxxxxxxxxxxxxx> and these will control the "threading" attributes of the MUA you are using to view the messages. Regards, Mike Klinke