Claws Mail 3.11.0

An email client and news reader derived from the well known Sylpheed mail application
Claws Mail
  3 Screenshots
Claws Mail is an open source software project that has been designed from the ground up to act as a lightweight email client application suitable for Linux-based operating systems that use a lightweight window manager/desktop environment. It is was previously known as Sylpheed-Claws.

Features at a glance

Key features include support for multiple accounts, support for GnuPG, colored labels, MIME attachments, threaded display, user-defined headers, email filtering, support for reading and posting Usenet new, as well as support for SSL connections for the IMAP4, POP3, SMTP and NNTP protocols.

In addition, it comes with a user-friendly, sophisticated and modern graphical user interface written in GTK+ and compatible with the GNOME, MATE, Cinnamon, LXDE or Xfce desktop environments, quick response, easy configuration, stability, intuitive operation, robustness and a powerful plugin architecture that lets users to extend its core functionality.

Under the hood and availability

A quick look under the hood will tell us that the application is written entirely in the C programming language, except for the graphical user interface, of course, which is written with the help of the GTK+ GUI toolkit. It is available for download as a source archive and can be installed on both 32-bit and 64-bit platforms.

However, the best way to install Claws Mail in your GNU/Linux operating system is to use the officially supported or community-derived packages provided in the main software repositories. Keep in mind though, that if your Linux distro has no packages for Claws Mail, you can still configure, compile and install the source archive.

Bottom line

Summing up, Claws Mail is indeed a very fast, stable, reliable and user-friendly email client that can rival even the powerful Mozilla Thunderbird applications. You can find it installed by default in a wide range of lightweight GNU/Linux operating systems. Before you can use the email client, it is a must to configure a default email account.

Reviewed by , last updated on October 20th, 2014

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license type:
GPL v3 
developed by:
Claws Mail Team
ROOT \ Communications \ Email
Claws Mail
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What's New in This Release:
  • SSLv3 server connections are now disabled by default, in response to the POODLE vulnerability, see
  • Several PGP/Core plugin improvements Indicate when a key has been revoked or has expired when displaying signature status. For example, "Good signature from %s, but the key has expired." "Good signature from %s, but the key has been revoked." When displaying the full information, show the Validity, and the Owner Trust level. Also indicate expired and revoked keys, and revoked UIDs. The "Content-Disposition: attachment" flag in PGP/MIME signed messages has been removed. It was confusing for cetain MUAs.
  • A new version of the RSSyl plugin, completely redesigned and rewritten. Migration from the previous version is automatic, it has a new storage format in ~/.claws-mail/RSSyl/ (hierarchical directories instead of flat file format). It uses the expat library instead of libxml2 for parsing feed data.
  • The results of TAB address completion in the Compose window have improved ordering. Order of results: 1. Match beginning of name 2. Match beginning of additional names 3. Match complete email address before @ 4. Match beginning of email address 5. Compare relative position of match 6. Compare name alphabetically 7. Compare address alphabetically.
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Claws MailClaws Mail

Application description

Claws Mail (previously known as Sylpheed-Claws) is an open source project that provides Linux users with a lightweight...

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