Mailrelay is a professional email marketing platform that provides a range of services to help businesses build successful email campaigns. It offers advanced analytics, customisable templates, and multiple integrations to help users improve their online visibility and engagement. By contrast, Elastic Email is a transactional email delivery platform designed to help developers quickly and easily send out emails on behalf of their applications. It offers a variety of features, including a customisable sending domain, built-in analytics, and a lightweight, modern UI. In contrast to Mailrelay, Elastic Email focuses more on providing a cost-effective way to deliver transactional emails rather than building email campaigns.