well i am the operator of my server (essentialsX versus permissionsEx)
i have totally permission: * seted ou owner group and i am alone on that group.
the guest group (players) have all vanish negation permission:

- -essentials.vanish
- -essentials.vanish.effect
- -essentials.vanish.interact
- -essentials.vanish.others
- -essentials.vanish.pvp
- -essentials.vanish.see

the command works to hidde me on tab list or /online list and to make players not see me on game. but!
if i logout and relogin on the server they can see me. If they logout and relogin, they can see me.
And the /tell command reveal me too. there is no way to config when a player send a tell receive a non-online player default msg ?