Email forwards can be useful for forwarding email from a non existing email account to one you check on a regular basis. You can also create an email forwarder for existing email accounts, however, email will be saved in both email accounts in-boxes. You will need to make sure you manually delete the email from the forwarded account to prevent from going over quota.
Creating an email auto responder is useful for letting people know you received their web form submitted email or for when you need to send an away message. The following video tutorial will assist you in setting up an auto-responder email. The first step is to log into your cPanel account.