>Michel, not that I've ever copied anybody but perhaps you could add a new section to the user instructions for the site:
>
>The "Ask nicely" option
>This option is available to all UT members. To use it:
>1) Click the envelope beside the other party's name.
>2) Type "Hello, I'd be grateful if you'd stop copying me on your Universal Thread responses, thanks very much!"
>3) Press Send.

I think a sensibility issue type message next to that option, by providing related info about it, might do it.