[cobalt-users] Reserved email aliases in cobalt

[User Groups <usergroups@xxxxxxxxxxxxxxxxxxx>]

Hi,

I have a RAQ 550, while creating a user called manager@xxxxxxxxxxxxxx , it 
gives me an error saying the alias manager is already in use.

Though it creates the user, but manager as an email alias is not being 
accepted.

Found in /etc/mail/aliases , that manager and many more such words (like, 
games, admin etc..) are owned by root.

Is there any way we could get to use manager as an email alias?
Has anybody tried editing the /etc/mail/aliases file??