me@my_server$ useradd -G director glenjohn glenjohn@my_server$ vi .forward :a glenjohn@fabrikam.com :wq And there are at least a few other ways to do that.

me@my_server$ useradd -G director glenjohn glenjohn@my_server$ vi .forward :a glenjohn@fabrikam.com :wq And there are at least a few other ways to do that. But you certainly don't have to be an admin to specify an alternate email address.