Are you unable to access your Bigpond mail due to forgot login password or unable to send and receive email through mail app like outlook, thunderbird or mac mail. To fix this problem you have to reset the password through following steps mentioned below.

Steps to reset Bigpond password through Telstra website
A. Open the web browser like chrome, edge, safari or Mozilla
B. Search for Telstra official website
C. Click on support option prompt in right side
D. Choose Telstra mail
E. Click recover my Bigpond email password
F. Type your Telstra username or Bigpond mail address for example @bigpond.com, @bigpond.net.au or @telstra.com
G. Click continue
H. Choose recovery method like registered number or alternate email address
I. Open Bigpond password reset link sent by Telstra
J. Select create new password rather than creating pass key
K. Create new password (Don’t use old or common password for account security)
L. Confirm new password again
M. Click save or done

After changing your Bigpond password go to Bigpond sign page to check password is successfully created by you is working. If you using email application in windows, mac, table or in Smart phone than update your latest Bigpond password. If you facing any error while changing Bigpond web mail password than contact Bigpond customer Service.

More Info: https://www.bigpondonlineservice.com/blog/change-bigpond-password-through-telstra-profile/