If you have been unable to access your Bigpond portal and login errors are visible on the screen, these errors could cause disruption in your communication. Sometimes, slow internet connections, outdated browser settings, or server errors trouble users. If you are facing this problem, first of all, check the internet connection to ensure it is stable. You can fix this by going to the settings and deleting the browser's history, as excessive accumulation can hamper the performance of the email.
If you use Bigpond email with a third-party mail client like Outlook, please check if the IMAP/SMTP settings have been correctly configured. Check the incoming server (imap.telstra.com, port 993) and the outgoing server (smtp.telstra.com, port 465 or 587), and the related settings. The latest update for the application also helps fix issues with the loading of the email.
On some occasions, Telstra may be experiencing issues that are outside the user’s control. You can check if they are on the affected list through the service disruption updates page. If there is no improvement after these procedures, it is advisable to contact Telstra's customer service. Do not permit errors relating to your emails to hinder your progress—resolve the troubles regarding your Bigpond email today!

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More Info: https://www.bigpondonlineservice.com/blog/bigpond-customer-care-victoria/