@dmcrobbie My advice is setup a Gmail account. It is free, better spam protection and security. The other advantage of Gmail is you are not tied into any Internet provider so if you decide to change providers it is one less thing you have to worry about.
Setup your Gmail account first, migrate you Optus emails to your Gmail account, change your email address with organisations that you are registered with, direct debits, businesses etc advise friends from your Optus account of your new email address.
I also use a free Outlook.com and Yahoo account as well they are also good alternates.