WooCommerce Product Promotion / Reminder Plugin allows Admin and seller to send mail when new product is added or update exisitng one. This is best plugin for promoting your product via mail.
This plugin Have many option to send mail like sent to users, customers and one extra functionality is importing mail list via CSV.
Note : If you want to change email template, then go to this plugin directory > includes > templates > emailtemplate > htmlemail.php. You can change your new template here.