When a player make /msg to an admin he can contact him and see that he is online.
My users have made macros that automatically write to all team members to test whether they are online.

Sry for my bad english.

What plugin handles your /msg command?

essentials

i have testet it since 1.6.2

Make sure you enable the essentials hook.

fakeannounce:
automaticforsilentjoin: false
join: '%p joined the game.'
quit: '%p left the game.'
hooks:
essentials: true
dynmap: false
JSONAPI: false
spoutcraft: false
checkupdates: true
permissionsupdates:
checkonworldchange: false
effects:
lightning:
count: 30
colornametags: true
permtest: false
debug: false
configVersionDoNotTouch:
SeriouslyThisWillEraseYourConfig: 5

its not only on my server

I'm asking the essentials folks about this.

thanks

Could I get Commandbook hook? http://dev.bukkit.org/bukkit-plugins/commandbook/