G Suite accounts (previously known as Cmail) for undergraduates are set to route all messages directly to the G Suite account address.

If you have never used G Suite before, you should Change Your NetID Password to ensure that your password is in sync for all Cornell services.

Forwarding is a bad idea, but if you really need to forward your messages to a non-Cornell address, you can set up forwarding to a single address using Google's instructions.