The following tables compare general and technical features of notable email client programs. General Basic general information about the clients: creator/company, O/S, licence, & interface. Clients listed on a light purple background are no longer in active development. Release history A brief digest of the release histories. Operating system support The operating systems on which the clients can run natively (without emulation). Protocol support Communication and access protocol support What email and related protocols and standards are supported by each client. Integration protocol support Authentication support SSL and TLS support Features Information on what features each of the clients support. General features For all of these clients, the concept of "HTML support" does not mean that they can process the full range of HTML that a web browser can handle. Almost all email readers limit HTML features, either for security reasons, or because of the nature of the interface. CSS and JavaScript can be especially problematic. Messages features Database, folders and customization Templates, scripts and programming languages Internationalization The Bat! supports Email Address Internationalization (EAI). As of October 2016, email clients supporting SMTPUTF8 included Outlook 2016, mail for iOS, and mail for Android. See also Comparison of feed aggregators Comparison of browser engines Comparison of mail servers Comparison of webmail providers List of personal information managers Unicode and email Webmail References External links T&B : Email : Clients (of historical interest—last updated in 1999) Mail User Agents for Linux Based Platforms (includes many email clients not listed in the above tables) Remail - research by The Collaborative User Experience group at IBM Email clients sv:E-postprogram#Jämförelse av epostklienter