You can access your emails from anywhere in the world via your web browser.
Simply browse to http://webmail.domain.com or http://domain.com/webmail to access your webmail.
You can sign in with the full email address (including the @domain.com.au), and your email password.
Note: Since Google Chrome and Mozilla Firefox now class http as not secure, you could see this page come up
The example above is Google Chrome
If you do get this message, click on ADVANCED and then click Proceed to webmail.yourdomain.com (unsafe)