Hello James,
Welcome to Atlassian Community!
As per the details you provided, I understand that you want to change the email address of the notifications, please correct if I'm wrong.
If that's the case, there are no limitations to that in the Free plan.
First, you need to verify the domain for an organization. Please, follow the steps of the documentation below:
After that, if you are using a next-gen project, go to Project settings > Notifications > Notification email.
If you have any other questions regarding this matter, please let us know.
Regards,
Angélica
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