bigpond email

Hey there, and welcome to Apple Support Communities ChrisPut,

We appreciate you reaching out to us about this matter and are here to help. We would like to ask you a couple of questions in order to get a better understanding. First, what is the email service provider connected to this email address? Is it an iCloud email , Gmail etc? Second, have you tried logging in directly to the website to see if your security credentials work? Finally, are you having any issues with other devices when trying to add said email?

While you gather this information, we recommend checking out this link : If Mail on your Mac keeps asking for your password - Apple Support

We thank you for your answers, they will help guide us to the next troubleshooting step.

Kindest regards!