Notification emails keep failing to send if I have multiple addresses set. I've tried comma separated with and without a space after, both fail the same way.
The error in the craft.log:
Email error: Invalid address: (addAnAddress to): email@example.com,firstname.lastname@example.org
The error in the commerce.log:
[Forced] Email “New Order - Admin” could not be sent for order “a713f1d”. Errors: