Can we use our cg email account from home or does it need to be from a cg computer?

its need to be from a computer on the CG network.

Remember that guy back in 2001 or 2002 that autoforwarded his CG email to his home email, then put a 'vacation' autoreply on his home email, resulting in one point five gazillion emails bringing the CG computer system to its knees?

It wasn't long before autoforwarding was banned.