On Fri, 04 Sep 2009 08:32:57 +0100, J. P. Gilliver (John) wrote:

I have seen such software, i. e. which assessed your post and told you
if the ratio of quoted to new text was too high (in fact IIRR wouldn't
let you post!)

Pan warns you about top posting as well as excessive quoting.

It is even available for Windoze systems.

http://pan.rebelbase.COM/