Unable to send from one (Bigpond) account

@DanPrice These are the recommended Bigpond SMTP SSL Settings.

https://www.telstra.com.au/support/category/email/set-up/imap-pop-and-smtp-information-for-manual-email-set-up#:~:text=Outgoing%20server%20details%3A%201%20Outgoing%20server%20address%3A%20smtp.telstra.com.,465%20(recommended)%20or%20STARTTLS%20on%20port%20587.%20

Manual Bigpond Outgoing server details:

  • Outgoing server address: mail.bigpond.com
  • Outgoing server port: 465 (recommended) or 587
  • Authentication: Yes
  • Encrypted connection: With SSL encryption

Username & Password:

  • User name: Your Telstra email address - ending in ‘@bigpond.com’, ‘@bigpond.net.au’ or ‘@telstra.com.’
  • Password: Your Telstra email account password - REMEMBER it’s case sensitive.

Note:- Alot of the Bigpond early email accounts where changed a few years ago to Telstra’s own mail servers (now called Telstra Mail) depending on when your Bigpond email address was setup. A friend of mines email was such one of those users and so we used the following SMTP setting “smtp.telstra.com” in Em Client which works fine. Good luck.

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Ps If you do change smtp server settings, first move any failed Bigpond emails into the eg: drafts folder and then once smtp server settings changed, try sending new emails.