Generally, the company email address is used for sending invoices. You can however also set a specific email address only for sending invoices.
Here is how to set or change it:
- Navigate to Settings and click on Company information
- Click on the pencil next to your company entity
- In 'Company details', fill out the field 'Invoicing email'
- Click on Save and close
- All invoices sent from your company will be sent from this email address.