Suz e-mail is hidden from the regular members. Izzies is not. I think Izzie must have switched this over in her profile.
As a Mod you can see a lot more than normal members, including e-mail addresses.
I do have the ability to turn it off to Mods, but it gives you the option to e-mail someone direct if you are having problems. I am not sure if Val, Nat or Kiz have used this.