The following tables compare general and technical features of a number of email client programs. Please see the individual products' articles for further information.
Maps, Directions, and Place Reviews
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.
Professional Emails Examples Video
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.
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 April, 2014, there were no email clients that support SMTPUTF8. As of October 2016, email clients supporting SMTPUTF8 included Outlook 2016, mail for iOS, mail for Android
Source of the article : Wikipedia
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