Allow Custom Default Invoice Email Address

Currently, the default invoice email address is automatically tied to the owner/admin account email and cannot be changed from the user side.

This creates confusion for teams that use separate billing or accounting emails. Even if additional invoice emails are added, the system still keeps the owner email as the default.

Feature Request:
Please allow users to:

• Change the default invoice email address
• Select any authorized email as the primary billing/invoice recipient
• Override the owner/admin email for invoices when needed

This would help organizations better manage billing communications and avoid invoices being sent to the wrong person or department.

Thank you!