If rounds of split testing, segmentation, and resends still result in low engagement scores for some of your subscribers then don’t be afraid to clean your list. Review subscriber data regularly to monitor activity and engagement ratings. Remove or further segment those who aren’t engaging in order to improve the overall open rates of your primary subscriber segments.
Your website is where the magic happens. This is the place where your audience needs to convert. Whether it is encouraging prospective buyers to sign up for your newsletter or fill out a form for a demo, the key is to optimize your website for converting browsers into actual leads.  Pay attention to forms, Calls-to-Action (CTA), layout, design, and content.
You may think direct mail is a thing of the past. But it’s still effective for targeted communications. Consider a content asset developed for high-level executives. Executives don’t usually browse the web for information. And it can be hard to get through to them via email. That means they may not come across the content you’ve developed with them in mind. This is where direct mail can prove powerful. You could send a direct mail piece to this audience to make them aware of your new, targeted content asset.  Direct mail also gives you a chance to grab the attention of a hot prospect by being creative and interesting with your message and presentation. https://getcrm.com/uploads/email-marketing-2.jpg
Over time, the popularity of email marketing campaigns resulted in personal email inboxes that were overflowing with the latest and greatest offers. Email campaigns grew and people grew tired of them. Laws that allowed customers to unsubscribe breathed new life into email marketing campaigns as customers could easily pick and choose the companies they were interested in. 
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