How can I change the email address in Zoho Books from which invoices are sent to my clients?

You can change your Zoho Books mail address by following these steps,

• Click on gear icon, on the top right corner and select Organization Profile.
• Specify a different email address for the primary contact and save changes

• Verify this process by opening the confirmation mail sent to the mail address you’ve specified.
• Invoices will now be sent out to your clients via this email address.