Small businesses looking for the best email marketing tools should consider Mailchimp, Constant Contact, and Sendinblue. Mailchimp is one of the most popular and widely used options with a user-friendly interface, powerful segmentation and personalization engine, robust automation and testing system, and comprehensive analytics and reporting dashboard. Constant Contact also provides a simple and intuitive interface, a large library of templates and images, flexible contact management and segmentation feature, easy-to-use automation and scheduling option, and detailed analytics and reporting tool. Sendinblue is an affordable option that also offers SMS marketing, chat, CRM, and landing pages. It features a sleek and modern interface, drag-and-drop email editor, smart contact list and segmentation feature, versatile automation and workflow builder, and clear and actionable analytics and reporting tool. All three tools integrate with many other tools and platforms. Mailchimp has a generous free plan for up to 2,000 contacts and 12,000 emails per month. Constant Contact has a 60-day free trial and a 30-day money-back guarantee. Sendinblue has a free plan for up to 300 emails per day and unlimited contacts.