You will have options to send newsletters from different email ids of your choice. This fulfills your requirement if you are an advertiser and managing multiple client portfolio. This also helps if you are looking to frequently send newsletters of different clients from single account, just change options and you are done.
You can track all your newsletter statistics with open, inbox clicks, online clicks details. Creating templates and newsletters are extremely simple and reusable. You can add contacts manually, import from other sources or get your subscribers signed up through your website.