hiwa said:
Specifically, does what newsreader client, which should be free and
open source, fulfill OP's requirement? My platform is Linux/GNOME.
I am pretty sure that any program that supports gnu/linux will do it.
I use thunderbird and it does it.
The feature you are looking for is called threads or threading. When
you turn on threads it will group all messages into a thread. When a
new message occurs for the thread it will bring that thread to the top
of the list.
The message will be at the end of that thread and you will see all
messages in the thread but that thread could be a month or two old and
go two the top of the list as their is a new entry in that thread.
I hope this makes some sense as it is somewhat hard to explain.
Cheers