sup is described as 'Sup is a console-based email client for people with a lot of email. It supports tagging, very fast full-text search, automatic contact- list management, custom code insertion via a hook system, and more' and is an app in the Office & Productivity category. There are more than 50 alternatives to sup for a variety of platforms, including Mac, Windows, Linux, Online / Web-based and iPhone. The best alternative is Thunderbird, which is both free and Open Source. Other great apps like sup are Microsoft Office Outlook (Paid), Evolution (Free, Open Source), eM Client (Freemium) and Apple Mail (Free).
Zoho Mail is a webmail service built with the needs of a modern business in mind. It provides features for business users to communicate effectively while catering to the customization and mailbox management needs of IT administrators.
Claws Mail is an email client (and news reader), based on GTK+, featuring Quick response Graceful, and sophisticated interface Easy configuration, intuitive operation Abundant features Extensibility Robustness and stability
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Claws Mail vs sup opinions
pros, cons and recent comments
This is actually the only GUI MUA I can tolerate, and it does everything I need. A nice bonus is the ManageSieve plugin, to handle filters on the mail server.
Postbox is an email application that helps you organize your work life and get stuff done. It has all the elegance and simplicity of Apple Mail, but with more power and flexibility to manage even the most demanding workloads.