Constant Contact is an Email marketing service that allows you create and publish online newsletters. It has dozens of customizable templates on various themes along with various layout and professional images. It supports drag and drop editing which leads to easy customization options along with branding support. All the templates are mobile friendly and responsive. Other features include detailed reporting and analytics, several contact importing options, Autoresponder capability, Spam-checker, Automatic duplicate email check and unsubscribe removal & free personal coaching and support.