automatically mark article expirable when first article in a thread is expirable

[David Bonnafous]

hi,

I am not a lisp guru, so if someone resolved this problem, could you
explain me how ?

I subscribed lots of mailing list. When a new thread begin, if the
subject of this thread don't interest me I must delete (or mark as
expirable) all the next mails in that thread. It is annoying...

Gnus is certainly able to do that for me, but how ?

thanks,
-- 
        David Bonnafous
        Institut de Mathématiques
        Université Paul Sabatier
        Toulouse - France