I managed to get it to work! Thanks for the contributions.
If anyone is wondering, i added the account as an email account instead of Microsoft Exchange account. For the email it's yourstudentnumber@zmail.unsw.edu.au and the password is obtained at zmail.unsw.edu.au/getpass (it's not your zpass).
I recently changed to the S3 and I'm having trouble adding my zmail. I've followed the instructions from https://www.it.unsw.edu.au/staff/email/exchange/android4.html but it still doesn't work.
Can anyone help?
Thanks in advance