eNewsletters eNewsletters are great for everyone. These are fully designed web ads delivered by email. Research shows that traditional direct mail advertising has a 1% - 2% ROI as opposed to 3%-5% using electronic newsletters. eNewsletters are efficient, more “targetable” and more response-driven than direct mail. They are also a great way to keep your clients up-to-date on new products and services that your company has to offer, events or seminars you might be hosting, or just about any message you wish to convey.