[X4U] List Threading and subject changes

[Steve Self]

Hey, can you all simply click-n-hold on the Reply-To address and then  
select New Message to start a new topic on the list?

This rather than the lazy habit of hitting reply and then just  
changing the subject...
Cause threading mixes in your lazy-new-topic with the prior topic.

Let's keep threading workable rather than messed up due to laziness  
and uniformed work flow methods.

Steve