This is not newsletter.
( This ( ( ( is not ) newsletter ) . ) )
(ROOT (S (NP (DT This)) (VP (VBZ is) (RB not) (NP (NN newsletter))) (. .)))
This is anything but a newsletter.
( This ( ( is ( anything ( but ( a newsletter ) ) ) ) . ) )
(ROOT (S (NP (DT This)) (VP (VBZ is) (NP (NP (NN anything)) (PP (CC but) (NP (DT a) (NN newsletter))))) (. .)))