By default, the time zone for webmail is set as automatic. You can change the settings using below mentioned steps:
Step 1: Login to the webmail using email address and password.
Step 2: Go to Settings icon from the top right corner.
Step 3: Go to the Preferences option and select the User Interface. Under the Main options >> go to Time Zone.
Step 4: Select the time zone (GMT +11:00) Australia/Sydney and click Save.
That’s it. Now you will receive the emails as per Australia/Sydney time zone.
You can also change the Time format, Date format and mail Refresh time here.