  We prove that even Coxeter groups, whose Coxeter diagrams contain no (4,4,2)
triangles, are conjugacy separable. In particular, this applies to all
right-angled Coxeter groups or word hyperbolic even Coxeter groups. For an
arbitrary Coxeter group W, we also study the relationship between Coxeter
generating sets that give rise to the same collection of parabolic subgroups.
As an application we show that if an automorphism of W preserves the conjugacy
class of every sufficiently short element then it is inner. We then derive
consequences for the outer automorphism groups of Coxeter groups.
