There are many email marketing platforms out there. These services help you deliver email to a wide audience and keep your address white listed.  This is no easy feat these days. Email has become an increasingly hard avenue for marketers. But it remains a critical one as the cost per email is amazingly low.  This is why you should be using a great email marketing system (also called platforms) to build and delivery your emails. These companies will also help you with list management. And a few will allow you to white label their email offering so you can sell it as your own.