The best alternatives to Email Insights are Keen, MailCharts, and Litmus. If these 3 options don't work for you, we've listed a few more alternatives below.
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SendGrid Email Analytics by Keen IO is the fastest way to analyze the performance of your email campaigns and take action. Compare campaigns and tests and download a list of users who performed any action. Use downloaded lists to keep your lists clean and drive up email performance with better campaigns.