Can I Email provides information on support for HTML and CSS features in various email clients. It lists the latest supported features and news items about email clients. It then shows a scoreboard comparing support for different features across email programs like Apple Mail, Gmail, Outlook, and others. Can I Email is maintained by Tilt Studio and is based on the original Can I Use site. It provides links to further details on features, a comparison tool, and data in JSON format. It aims to help users understand what coding can be used in emails for different clients.