Claws Mail

Software Screenshot:
Claws Mail
Software Details:
Version: 3.16.0 updated
Upload Date: 22 Jun 18
Developer: Claws Mail Team
Distribution Type: Freeware
Downloads: 56

Rating: 2.3/5 (Total Votes: 3)

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.

What is new in this release:

  • New in this release:
  • Preferences: for the 'default selection on entering a folder' on the Display/Summaries page, the first new, first unread, and first marked message options are now sort-order aware.
  • Preferences: the previously hidden preference to 'Warn when sending to more recipients than []' has been added to the Mail Handling/Sending page.
  • Preferences: Toolbars/Compose window: Sign/Encrypt toggle buttons can been added to the toolbar.
  • Preferences: Fancy Plugin: allow stylesheet file/folder names to have spaces in them.
  • Account Preferences: a 'Show password' checkbox has been added next to the password fields.
  • Account Preferences: the OpenPGP and S/MIME preferences have been split into two separate pages.
  • Account Preferences: newline characters are disallowed in account usernames and passwords, and warnings are shown to the user if this is attempted.
  • Compose: more UTF-8 list-item characters have been added.
  • Address book: a 'Show password' checkbox has been added next to the LDAP server 'bind password' field.
  • GPG: full key/signature fingerprints are now shown instead of the short versions.
  • SSL Certificate Manager: added support for ipv6 addresses.
  • NNTP: Fetch XOVER and XHDR data in batches of 5000 and use the statusbar progress meter when opening/refreshing a NNTP folder.
  • CLI: the --insert option has been added to --compose, to allow inserting files from the command line.
  • Plugins window: keyboard shortcuts to Load/Unload buttons have been added.
  • PDF Viewer Plugin: a print button has been added.
  • The HTML parser now supports all entities.
  • Tools: a simple bash completion helper has been added, tools/bash_completion/claws-mail.
  • Updated translations: Brazilian Portuguese, Catalan, Czech, Danish, Dutch, Finnish, French, German, Hungarian, Italian, Norwegian Bokmal, Russian, Slovak, Spanish, Swedish, Turkish.
  • New translations: Japanese, Polish, Romanian.
  • Bug fixes:
  • o bug 3266, 'procmime.c: FILE leak in specific circumstances'
  • o bug 3784, 'Very similar strings in src/gtk/about.c'
  • o bug 3793, 'Segfaults when master passphrase dialog is launched in the middle of autocompletion'
  • o bug 3795, 'Fix typo in utils.c'
  • o bug 3796, 'Fix format-security warnings in alertpanel_ use'
  • o bug 3797, 'Unfold quoting renders quotes completely confusing'
  • o bug 3801, 'Broken auto wrapping'
  • o bug 3808, 'vCalendar plugin does not load due to undefined symbol icaltime_from_timet'
  • o bug 3813, '"mouse up" activates link even if "mouse down" occurred outside the link / cannot copy link text'
  • o bug 3814, 'end of mouse drag or text selection erroneously activates links'
  • o bug 3819, 'Duplicate definition of global pygtk symbols'
  • o bug 3821, 'Potential security issue with libetpan code in mailmbox plugin'
  • o bug 3916, 'message view shows wrong message contents'
  • o bug 3843, 'Non-functional "Change to..." command in Spelling menu'
  • o bug 3852, 'delete header entry button doesn't restore colour'
  • o bug 3881, 'Hide Read Threads eats emails'
  • o bug 3886, '"About to send mail to 2 recipients" warning when one of them is Reply-To'
  • o bug 3892, 'build fails with enchant-2.1.0'
  • o bug 3893, 'Text mode open/copy web links ignores trailing tilde(s)'
  • o bug 3924, 'Fix configuration of sieve plugin on FreeBSD (segfaulted)'
  • o bug 3931, 'segfault searching server with master password'
  • o off-by-one error in textview's quote unfolding
  • o Make sure outgoing messages have a trailing newline
  • o 'add_to_addressbook' filtering action correctly add the name
  • o improved handling of bad filenames get_serverport() in ssl_manager.c
  • o building against older webkitgtk versions
  • o crash in mailimf_group_parse() in mailmbox plugin
  • o missing invalid regexp indication in folder preferences.
  • o truncated input widgets in preferences window
  • o ignore_thread not marking complete thread
  • o buffer length handling in GnuTLS password encryption and decryption
  • o many memory leaks

What is new in version :

  • Bug fixes:
  • bug 3348, 'Contact pictures not deleted when contact is deleted'
  • bug 3721, 'Fails to build in Debian kfreebsd-*'
  • bug 3744, 'Crash upon deleting tags.'
  • bug 3822, 'AttRemover deletes message and fails to create new one when disk is full'
  • bug 3828, '"Re-edit" should not recycle the Message-ID header'
  • bug 3835, 'autogen.sh fails with invalid test on line 33'
  • bug 3855, 'segfault at startup with old profile and IMAP account'
  • bug 3866, 'slibtool causes compile failure'
  • fix crash in sieve manager window when no account has sieve enabled.
  • fix incorrect labels in folder selection dialog.
  • fix RSSyl feeds getting renamed to "Untitled feed".
  • fix Resent-Date value.
  • Fix typo around libarchive in configure.ac.

What is new in version 3.15.0:

  • More granular options on when to open a selected message have been added. There are now several checkboxes on the Display/Summaries page of the Preferences which allow a greater flexibility.
  • Compose window: Show the total size of attachments on the Attachments tab.
  • Compose window: Bcc has been added to the headers drop-down list.
  • Folder list: Top-level folders can now be copied. They are created as regular folders in the target mailbox.
  • Folder selection dialogue: Left/right keys collapse/expand rows. Further keypress will move the cursor to parent or first child, respectively.
  • Menu items: 'Mark all unread [recursively]' has been added to the folder context menu, message list menu, and the main window menu and toolbar.
  • Toolbar actions: Mark, Unmark, Lock, Unlock, Mark [all] read, Mark [all] unread, Ignore Thread, Watch Thread, and Delete Duplicate Messages have been added to the main window toolbar's Actions list.
  • Account compose signature: The value of the signature file now takes a path relative to the user's home directory in addition to a full path.
  • Icon Themes: Support for SVG themes with icon scaling capabilities has been added. This requires libRSVG 2.40.5 or newer.
  • Hidden preferences: colours for specifying Tags, QuickSearch, and auto-filled header values have been added, both foreground and background. Respectively, tags_color, tags_bgcolor, qs_active_color, qs_active_bgcolor, qs_error_color, qs_error_bgcolor, default_header_color, and default_header_bgcolor.
  • Hidden preferences: warn_sending_many_recipients_num, if greater than zero, a warning dialogue is shown when the number of recipients exceeds the number given.
  • GData plugin: This plugin now requires libgdata version 0.17.2 or newer.
  • TNEF parser plugin: This plugin now uses an external libytnef.
  • vCalendar plugin: This plugin now uses an external libical, version 2.0.0 or newer is required.
  • Mail Archiver plugin: - updated to support some of the compression formats up to libarchive 3.2.2
  • Several minor UI improvements.
  • Updated manual in English and Spanish.
  • Updated man page.
  • Updated translations: Brazilian Portuguese, Catalan, Danish, Dutch, French, German, Hungarian, Italian, Norwegian Bokmal, Russian, Spanish, Swedish, Traditional Chinese, and Turkish.
  • Bug fixes:
  • bug 3251, 'A translated In-Reply-To header is sent translated'
  • bug 3571, 'recipient list lost and truncated'
  • bug 3574, 'Template addressing'
  • bug 3582, 'Select folder dialogue does not tell what is selecting for'
  • bug 3673, 'Be more friendly instead of "configure: error: 'encrypt'-function not found."'
  • bug 3734, 'undefined symbol error with flex-2.6.2'
  • bug 3740, 'Templates information dialog can't be closed with WM button' 0 bug 3741, 'Deleting an account doesn't delete imapcache'
  • bug 3742, 'Attaching file with plus sign in filename via drag and drop doesn't work'
  • bug 3762, 'redirect fails'
  • bug 3764, 'Use external libical instead of the internal copy'
  • bug 3775, 'Error in string at src/mainwindow.c:4726?'
  • bug 3777, 'Weird news dates for some RSS feeds'
  • Debian bug 846170, 'incorrect IMAP UID handling'
  • Allow sending empty messages in Session (just rn).
  • fix some main window menu sensitivity issues
  • make up/down key navigation obey 'always_show_msg'
  • fix text selection when double-clicking quoted text and 'collapse quoted text on double click' is turned off
  • fix 'Go to' moving off current, unopened msg, and dialogue to go to next folder
  • obey 'always_show_msg' on "no more [...] msgs. go to next folder?"
  • make Go to/[Next|Prev] sort order aware
  • don't ignore auto-account selection when forwarding on IMAP and NNTP accounts
  • on first run, use --alternate-config-dir (if set) on prefs migration. prevents useless creation of ~/.claws-mail directory
  • fix colouring of auto-filled headers
  • don't remove the To when changing account
  • Honour autosave_encrypted preference when using external editor.
  • Fix 'search folder' not working in some cases
  • Fix build on OSX.
  • fix memory leaks
  • when renaming folder, only update summaryview folder name if the current folder is being renamed
  • sensitise trayicon's 'get mail' and 'exit'
  • Handle timezones correctly in vCalendar.
  • Do not hardcode resolv.conf location
  • fix building with --disable-deprecated

What is new in version 3.14.1:

  • 'hide_timezone', a new hidden preference that sets the timezone ofdate fields sent over the network to the unknown timezone value asspecified in RFC 5322 §3.3. Default value is false (i.e., sendavailable timezone information).
  • 'rewrite_first_from', a new hidden preference which works around alimitation of some servers with 'overly-liberal parsers'. When thisis turned on and the Content-Transfer-Encoding is set to 8bit or7bit, in a message body starting with 'From ' the 'From ' willbecome '=46rom ' (i,e, encoded form of 'F') and the Content-Transfer-Encoding will be changed to Quoted-Printable. When it isturned off no such modification will be made but it is very likelythat an MTA will convert the 'From ' to '>From '. See RFC 4155 forfurther details. Default value is '1', turned on.
  • Templates: it is now possible to attach a file, using'|attach_output{sub_expr}' or '|A{sub_expr}', 'sub_expr' isevaluated as a command-line to get the filename name from, using anabsolute /path/to/filename.
  • IMAP mailboxes which show subscribed folders only are now indicatedby a green folder icon.
  • The Icon Legend has had the missing folder icons added and also hasan improved layout.
  • Drafted messages: Do not add Message-ID for draft, unless themessage already has one. A Message-ID header is now only added whenqueuing a message, and any existing Message-ID and Referencesheaders in drafts, if there are any, are kept.
  • Disable hiding threads and messages in draft folders.
  • The /View/Go to/... actions now respect the 'Open message whenselected' option.
  • In the UI 'POP' is used instead of 'POP3', 'IMAP' instead of'IMAP4', 'SSL/TLS' instead of 'SSL'.
  • GnuTLS: Enforce "strong enough" Diffie-Hellman prime even whenusing older versions of GnuTLS library.
  • Since GnuTLS 3.1.7, this minimum size is dictated by the prioritystring, and currently (GnuTLS 3.3.0) the "safe-enough" value is1008 bits. We set this minimum size explicitly for older GnuTLSversions.
  • Users who are affected by this (their servers use DH prime smallerthan 1008 bits) can override this by using a priority stringstarting with the keyword "LEGACY". However, this keyword onlyworks with GnuTLS 3.3.0 or newer.
  • RSSyl plugin: Enable keeping old items by default.
  • vCalendar plugin: The ics file name is now used for the WebCalsubscription folder name.
  • vCalendar plugin: Use hours/minutes for vcalendar alert time.
  • Notification plugin: Add support for unity/messaging menu.
  • PDF Viewer plugin: The icons are now themeable.
  • Updated manual in English and Spanish.
  • Updated translations: Brazilian Portuguese, Catalan, Czech, Danish,Dutch, Finnish, French, Hebrew, Indonesian, Italian, NorwegianBokmal, Russian, Slovak, Spanish, Swedish, Traditional Chinese,and Turkish.
  • Bug fixes:
  • bug 2918, 'Notification Popup icon is hardcoded'
  • bug 3207, 'Claws segfaults when closing LDAP-enabledaddress book'
  • bug 3515, 'Ctrl-Shift-X opens multiple external editors'
  • bug 3638, 'GData Plugin fails after initial Googlehandshake'
  • bug 3665, 'Fix config script for macOS'
  • bug 3666, 'Typos in Turkish translation'
  • bug 3667, 'segfault in imap_session_authenticate'
  • bug 3675, 'RSSyl crash when opening Atom feed'
  • bug 3676, 'RSSyl crash when opening Atom feed with XMLdepth >= 3'
  • bug 3678, 'Segfault when trying to add new account'
  • bug 3684, 'Socket error with POP3 using TLS clientcertificate'
  • bug 3697, 'Export to mbox' causes crash'
  • bug 3705, 'active account Mail Address corrupted whenaddress in Message-ID is used'
  • bug 3711, 'Usage of (s)'
  • bug 3712, 'Name of the example domain in the translation'
  • fix non-resizeable Icon Legend dialogue
  • Fix a potential bug in vcalendar's libical
  • Fix potential crash in vcalendar's icalcomponent_vanew() on 64-bit archs.
  • Fix regression: show simple text/calendar with plugin.
  • Fix crash in vcalendar passwords handling on prefs save.
  • Few miscellaneous fixes for RSSyl.
  • several memory leaks.
  • Don't check for encrypt() on FreeBSD.
  • Add OpenBSD CA cert path.
  • Do not process folder marks when just refreshing summaryview

What is new in version 3.14.0:

  • Passwords can now be secured with a Master Passphrase. (/Configuration/Preferences/Other/Miscellaneous/)
  • Passwords: The password storage method has changed. All passwords are now stored in a separate file, (~/.claws-mail/passwordstorerc), and use a stronger encryption than previously. Existing passwords are moved to the new file automatically, in the old format. The new format will be used whenever old passwords are changed or when a Master Passphrase is used. All new passwords are saved using the new format, irrespective of whether a Master Passphrase is used or not. Further information can be found here: http://www.claws-mail.org/doc/password_encryption.txt
  • Compose window: Removed the outer scrollbar from header area.
  • Message view: The HTML to plain text converter now indicates list items with a hyphen (-), adds a line break after , and indents text within blockquotes.
  • Main window: Changed default /View/Show or hide/Menubar shortcut to Ctrl+F12.
  • SSL certificates list: Added automatic scrollbar.
  • Address book: Double-clicking datasources now opens the edit dialogue.
  • Forwarding: The external editor is now automatically used when forwarding as attachment, if the preference is set.
  • Preferences: Automatic mail checking can now be configured in hours, minutes and seconds. (/Configuration/Preferences/Mail Handling/Receiving)
  • Preferences: The 'next_on_delete' hidden preference now applies to trashing or moving, in addition to deleting, a message.
  • Command line: Added -geometry to set geometry for main window.
  • IMAP: Added SASL 'PLAIN' and 'LOGIN' authentication methods for accounts. Renamed the old plaintext 'LOGIN' to 'plaintext'.
  • IMAP: The acccount preference, 'Move deleted mails to trash and expunge immediately' has been removed.
  • Notification plugin: Added 'Get mail from account...' to the SysTray module's menu.
  • Notification plugin: Focus the widget between iconify/deiconify events.
  • Tools: Added tools/cm-reparent.pl, which can be used to fix thread parenting for two or more messages.
  • Documentation: Updated man page and manual.
  • Translations: Updated: Brazilian Portuguese, Catalan, Czech, Dutch, Finnish, French, German, Hungarian, Italian, Slovak, Spanish, Swedish, Traditional Chinese. Added: Danish, Indonesian, Turkish. Dropped: Lithuanian (unmaintained)
  • Bug fixes:
  • bug 2518, '"Reply-All" message from NNTP-account does not contain CC'ed correspondents'
  • bug 2781, 'Unsanitised Folder Creation'
  • bug 3028, 'Claws doesn't select html part if attachments present'
  • bug 3213, 'Line break in subject of message'
  • bug 3573, 'Out of bounds read in macro LBREAK_IF_REQUIRED in codeconv.c'
  • bug 3581, 'sys:1: Warning: Source ID # was not found when attempting to remove it'
  • bug 3603, 'Feeds from Reddit are empty'
  • bug 3610, 'Heap use after free in privacy_mimeinfo_check_signature()'
  • bug 3616, 'segfault setting up new CM in new userid'
  • bug 3623, 'Client crash on importing duplicated feed'
  • bug 3629, 'Invalid subject can distort message list view'
  • bug 3652, 'utils.c:4740:47: warning: ordered comparison of pointer with integer zero [-Wextra]'
  • bug 3653, 'Upgrading from Mageia5 default (3.11.1), 3.13.2git tries to load 3.11.1 plugins'
  • bug 3658, 'Passphrase ignored during keypair generation with gpg2'
  • include Reply-To value when using 'reply to all'
  • inputdialog modality and focus issue
  • fix Compose account selection when imap folder is selected.
  • set correct rcdir on Win32
  • Fix behavior in selecting PGP MIME signature on Windows.
  • RSSyl: typo in handling feed name ending with a period on Win32
  • vCalendar: Handle ical lines longer than 256 bytes

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