Claws Mail is described as 'GTK+-based client offering fast performance, news reading, robust stability, extensibility via plugins, advanced filtering, encryption, folder and contact management' and is a very popular Email Client in the office & productivity category. There are more than 50 alternatives to Claws Mail for a variety of platforms, including Windows, Mac, Linux, Android and Web-based apps. The best Claws Mail alternative is Thunderbird, which is both free and Open Source. Other great apps like Claws Mail are K-9 Mail, Betterbird, Microsoft Outlook and Evolution.
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NeoMutt is a command-line mail reader. It's a version of Mutt with added features.
Experimental terminal mail client aiming for configurability and extensibility with sane defaults.
ProfiMail is a powerful email client for mobile phones. It allows you to read your mail on the go, and send text with attachments directly from your phone. Send photos, recorded sound or simply text messages to friends, from anywhere.
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Balsa is an e-mail client for GNOME, highly configurable and incorporating all the features you would expect in a robust mail client.
Columba is an email client written in Java, featuring a user-friendly graphical interface with wizards and internalionalization support. Its a powerful mail management tool with features to enhance your productivity and communication.
Clyton is an email client with advanced security and spam filtering features. Although priced for the general public, Clyton possesses the reliability and security required by businesses.
NorthReader is an RSS feed reader created with love and determination of progression in a pioneer world of digital media.
Mulberry is a powerful, easy to use electronic mail (email) and calendar program that allows you to send, access, and manage email and calendars. Mulberry also helps you manage other related information, such as contact information.
SolMail is a powerful e-mail client that helps you to manage all of your e-mail accounts & messages in one app!
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Well it is NOT a GPG secured environment as can Claws can be set up as! Besides development was stopped 9 years ago, so that is the second reason against this app being any kind of an alternative for Claws.