The Invoice Email Magento extension creates an extra field in user registration form for invoice and shipment emails. Customer can specify a different email address for receiving invoice and shipment emails and if not specified will get emails on his default email address. Customer can provide alternate email address for invoice or shipment emails during checkout or registration form. Order confirmation emails will always be sent to the default email address. Admin can enable/disable module and can specify if the emails should be sent to both or only invoice email address.
Community Edition 1.5.x.x - 18.104.22.168
Enterprise Edition 1.10.x.x - 22.214.171.124
Enable/Disable Invoice Email module
Configure to send emails to Both or only Invoice email address
Easy installation without modifying core files.