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Claws Mail - a GTK lightweight and fast e-mail client --------------------------------------------------------------------- Copyright (C) 1999-2023 The Claws Mail Team and Hiroyuki Yamamoto This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program. If not, see <http://www.gnu.org/licenses/>. For more details see the file COPYING. --------------------------------------------------------------------- Summary: 1. What is Claws Mail? 2. Plugins 3. Actions 4. Icon Themes 5. Quick Search 6. Custom toolbar 7. Partial downloading of POP3 mails 8. Hidden Options 9. Tools 10. How to contribute 11. How to request features 12. Installing Claws from Git 13. Release History 14. Useful Links 1. What is Claws Mail? -------------------------- Claws Mail is a lightweight and highly configurable email client and news reader based on the GTK GUI toolkit, it runs on the X Window System. Claws Mail is free software distributed under the GNU GPL. To run Claws Mail use 'claws-mail' on the command line. When claws-mail is executed for the first time a configuration 'Wizard' will appear prompting you for the minimum information necessary to create a new account. 2. Plugins ---------- Claws Mail' capabilities are extended by plugins. It comes with the following plugins included, all of which are built automatically if the required libraries are present. Plugins are installed in $PREFIX/lib/claws-mail/plugins/ and have a suffix of '.so' To load a plugin go to '/Configuration/Plugins' and click the 'Load Plugin' button. Select the plugin that you want and click 'OK' All plugin preferences can be found under '/Configuration/Preferences/Plugins/'. o ACPI Notifier Notifies of new mail via the mail LED available on some laptops. The LED can be set to blinking or on states when new mail is received. Appropriate kernel modules have to be loaded first for this plugin to work. Laptops supported are from ACER (acerhk and acer_acpi modules), ASUS (asus_laptop and asus_acpi), IBM (ibm_acpi), Lenovo (tm_smapi) and Fujitsu (apanel) manufacturers. o Address Keeper Saves mail addresses typed in the 'To', 'Cc' or 'Bcc' fields of outgoing messages to a designated folder in the address book. Addresses are saved only if not already present in the address book. o Archiver Archives mail folders using libarchive library. Folders can be archived with or without compression (ZIP, GZIP or BZIP2) and also in several formats (TAR, SHAR, PAX or CPIO). Libarchive is available from https://www.libarchive.org/. o Attachment Remover Selectively removes attachments from messages. Messages are permanently modified by using this feature, so be careful! o Attachment Warning Warns the user of possibly forgotten attachments when some keywords are found in the outgoing messages. False positives (being warned when no attachment is realy needed) exist, but some configuration options can help to reduce their probability. o Bogofilter Enables the scanning of incoming mail received from a POP, IMAP, or LOCAL account using Bogofilter. It can optionally delete mail identified as spam or save it to a designated folder. Bogofilter is a pure Bayesian filter, therefore it has better speed performance than SpamAssassin but might catch less spam. Bogofilter is available from https://bogofilter.sourceforge.io/. o BSFilter Checks all messages received from IMAP, POP or local accounts using BSFilter, a bayesian spam filter program, which has to be installed locally. Messages identified as spam can be deleted or saved to a designated folder. Bsfilter is available from https://osdn.net/projects/bsfilter/. o Clamd Uses the Clam AntiVirus in daemon mode to scan received messages from IMAP, POP or local accounts. Scanning is done through a socket to the daemon, so it has to be previously configured to allow this. Clam AntiVirus is available from https://www.clamav.net/. o Dillo Uses the Dillo browser (https://www.dillo.org/) to render HTML mails and HTML parts of multipart messages. Dillo is started with special options to embed its window inside Claws Mail's message view and to render the HTML safely. If required, remote content can be also retrieved. o Fancy Renders HTML mails and HTML parts of multipart messages using the GTK port of the WebKit library. External content is blocked by default (including images) to avoid remote tracking, but can be enabled either globally or just on the displayed message. The GTK WebKit is available from https://trac.webkit.org/wiki/WebKitGTK. o Fetchinfo Modifies downloaded messages and inserts special headers containing some download information: UIDL, Claws Mail account name, POP server, user ID and retrieval time. These headers can be used later for more elaborate filtering or processing rules. o Keyword Warner Shows a warning when sending or queueing a message and a reference to one or more keywords is found in the message text. o Libravatar Displays sender avatars from https://www.libravatar.org/, from own sender's domain if enabled or even an automatically generated one. o LiteHTML Viewer Renders HTML mails and HTML parts of multipart messages using the using the litehtml library (http://www.litehtml.com/). External content is blocked by default (including images) to avoid remote tracking. o MailMbox Handles mailboxes in Mbox format using the libEtPan! library. Mbox files can be added to the folder tree and used like regular mailboxes. LibEtPan! is available from https://www.etpan.org/libetpan.html. o Managesieve Manage sieve filters on a server using the ManageSieve protocol. o Newmail Writes a header summary to a log file for each mail received after sorting. The file for the summary is ~/Mail/NewLog. o Notification Provides various ways of notifying the user of new and unread email. Current methods include: a banner, a popup window, a user command, a message to a LCD daemon, a system tray icon and an indicator icon. Sound notifications are also possible through libcanberra. Each method can be customized in detail through the plugin preferences. Indicator library is available from https://launchpad.net/libindicator/ and libcanberra from https://0pointer.de/lennart/projects/libcanberra/. o Perl Extends the filtering possibilities of Claws Mail. Provides a Perl 5 interface to Claws Mail's filtering mechanism, allowing the use of full Perl power in email filters. A conversion script is provided to translate user rules into perl rules suitable for this plugin. Perl is available from http://www.perl.org/. o PDF Viewer Displays Portable Document Format (PDF) and PostScript attachments within the message view using Poppler. PostScript attachments are converted to PDF on the fly by the 'gs' tool, which has to be installed first. The 'gs' tool is available from https://pages.cs.wisc.edu/~ghost/. The Poppler library is available from https://poppler.freedesktop.org/. o PGP/Core Handles core PGP functions and is required by the PGP/Inline and PGP/MIME plugins. Uses GnuPG/GPGME, https://www.gnupg.org/software/gpgme/index.html. o PGP/inline Handles inline PGP signed and/or encrypted mails. You can decrypt mails, verify signatures or sign and encrypt your own mails. Uses GnuPG/GPGME, https://www.gnupg.org/software/gpgme/index.html. o PGP/MIME Handles PGP/MIME signed and/or encrypted mails. You can decrypt mails, verify signatures or sign and encrypt your own mails. Uses GnuPG/GPGME, https://www.gnupg.org/software/gpgme/index.html. o Python Provides Python scripting access to Claws Mail functions. A testing console is also featured. Scripts can be saved to specific folders for automatic loading on startup or being available as new menu items under the '/Tools/Python scripts' menu. Python is available from https://python.org/. o RSSyl Creates mailboxes where newsfeeds in RSS 1.0, RSS 2.0 or Atom format can be added. Each newsfeed will create a folder with the appropriate entries, fetched from the web. You can read them, and delete or keep old entries. o S/MIME Handles S/MIME signed and/or encrypted mails. You can decrypt mails, verify signatures or sign and encrypt your own mails. o SpamAssassin Scans incoming mail received from a POP, IMAP or LOCAL account using SpamAssassin. It can optionally delete mail identified as spam or save it to a designated folder. SpamAssassin is available from https://spamassassin.apache.org/. o Spam Report Reports spam messages to online spam harvesting sites. Sites suported are https://www.signal-spam.fr/ and https://www.spamcop.net/. The Debian mailing list spam nomination system is also supported. o TNEF Parser Decodes attachments with 'application/ms-tnef' MIME type (also known as "winmail.dat" files) in Claws Mail, using the ytnef library. Decoded parts can be saved to files. The ytnef library is available from https://github.com/Yeraze/ytnef. o VCalendar Displays vCalendar messages. Only the meeting subset of the vCalendar format is currently supported, which includes planning, sending and receiving invitations and answering them. Public calendar (WebCal) subscriptions, free/busy information export/import and reminding of events is also supported. Additional plugins can be found here: https://www.claws-mail.org/plugins.php 3. Actions ---------- The "actions" feature is a convenient way for the user to launch external commands to process a complete message file including headers and body or just one of its parts. It allows also the use of an external command to filter the whole text or just a selected part in the message window or in the compose window. This is a generic tool that allows to do any uncommon actions on the messages, and thus extends the possibilities of Claws Mail. For example, Claws Mail does not include the rot13 cyphering algorithm popular in some newsgroups. It does not support uuencoded messages. As all these features can be handled by external programs, the actions provide a convenient way to use them from the menu bar. a. Usage -------- To create a new action, go to Configuration -> Actions.... The "Action Creation" dialog offers to enter the Menu name that will trigger the command. The created menu will be found in the Tools -> Actions submenu. By inserting a slash / in the menu name, you create a submenu. The command is entered in the Command line entry. Note that Claws Mail stores every single email in a separate file. This allows to use the following syntax for the command: * %f denotes the file name of the selected message. If you selected more than one, then the command will be launched for each message with the appropriate file name * %F denotes the list of the file names of the selected message. If only one message is selected, this amounts to %f, but if more messages are selected, then the command will be launched only once with the list of the file names. (You can use both %f and %F in one command: then the command will be launched for each selected message with the name of this message and with the list of all selected messages. I did not find a practical example for this.) * %p denotes the current selected message part of a multipart message. The part is decoded accordingly. If the message is not a multipart message, it denotes the message body. * Prepending >: this will allow you to send to the command's standard input a text that you will enter in a dialog window. * Prepending *: this will allow you to send to the command's standard input a text that you will enter in a dialog window. But in contrast to prepending >, the entered text is hidden (useful when entering passwords). * Appending an ampersand &: this will run the command asynchronously. That means "fire and forget". Claws Mail won't wait for the command to finish, nor will it catch its output or its error messages. * Prepending the vertical bar | (pipe-in): this will send the current displayed text or the current selected text from the message view or the compose window to the command standard input. The command will silently fail if more than one message is selected. * Appending the vertical bar | (pipe-out): this will replace the current displayed text or the current selected text from the message window or the compose window by the command standard output. The command will silently fail if more than one message is selected. Note: It is not possible to use actions containing %f, %F or %p from the compose window. When a command is run, and unless it is run asynchronously, Claws Mail will be insensitive to any interaction and it will wait for the command to finish. If the command takes too long (5 seconds), it will popup a dialog window allowing to stop it. This dialog will also be displayed as soon as the command has some output: error messages or even its standard output when the command is not a "pipe-out" command. When multiple commands are being run, they are run in parallel and each command output is separated from the outputs of the others. a. Examples ----------- Here are some examples that are listed in the same syntax as used for storing the actions list. You can copy and past the definition in your ~/.claws-mail/actionsrc file (exit Claws Mail before). The syntax is very simple: one line per action, each action contains the menu name and the command line separated by a colon and a space ": " Purpose: rot13 cyphering Definition: Rot13: |tr a-zA-Z n-za-mN-ZA-M| Details: This will apply the rot13 cyphering algorithm to the (selected) text in the message/compose view. Purpose: Decoding uuencoded messages Definition: UUdeview: xdeview %F& Details: xdeview comes with uudeview. If an encoded file is split in multiple messages, just select them all and run the command. Purpose: Display uuencoded image Definition: Display uuencoded: uudec %f& Details: Displays uuencoded files. The uudec[1] script can be found in the 'tools' directory of the distribution package. Purpose: Alter messages Definition: Edit message: gvim -f %F Details: Allows editing of any received message. Can be used to remove unneeded message parts, etc. Purpose: Pretty format Definition: Par: |par 72Tbgjqw74bEe B=._A_a 72bg| Details: par is a utility that can pretty format any text. It does a very good job in indenting quoted messages, and justifying text. Used when composing a message Purpose: Browse Definition: Part/Dillo: dillo %p& Details: Browse the selected message part in Dillo. [1] The uudec script can be found in the 'tools' directory of the distribution package. It needs uudecode and ImageMagick's display. The latter can be replaced by any image viewer that can get input from standard input. The script could also be modified to use temporary files instead of standard input. 4. Icon Themes -------------- Claws has support for different icon sets. Several icon sets can be downloaded from https://www.claws-mail.org/themes.php You will need to create a directory called 'themes' in your config directory, unpack them into this directory, and then use the interface to select them, /Configuration/Preferences/Display/Themes This interface can also be used to install new themes. 5. Quick Search with extended search ------------------------------------ Quick Search, with its powerful Extended search function, enables searching through folder's messages. Extended Search allows one to define criteria that messages must have in order to match and be displayed in the summary view pane. Search types titled From, Subject and To are self explanatory. Search type extended allows one to use Claws Mail's powerful filtering engine to select messages. Examples: from regexpcase "foo" subject regexp "Bug" & to regexp "claws-mail" Additionally, it is possible to use simpler yet equally powerful patterns for message selections. Mutt users will immediately recognise most of the available patterns: Pattern Parameter Selects -------------------------------------------------------------------------- a all messages ag # messages whose age is greater than # days al # messages whose age is lower than # days agh # messages whose age is greather than # hours alh # messages whose age is lower than # hours b S messages which contain S in the message body B S messages which contain S in the whole message c S messages carbon-copied to S C S message is either To: or Cc: to S D deleted messages da "YYYY-MM-dd HH:mm:ss" messages whose date is after requested date (time is optional) db "YYYY-MM-dd HH:mm:ss" messages whose date is before requested date (time is optional) e S messages which contain S in the Sender field E S true if execute "S" succeeds f S messages originating from user S F forwarded messages h S messages which contain S in any header name or value H S messages which contain S in the value of any header ha messages which have attachments i S messages which contain S in Message-Id header I S messages which contain S in In-Reply-To header k # messages which are marked with color # L locked messages n S messages which are in newsgroup S N new messages O old messages p incomplete messages (not entirely downloaded) r messages which have been replied to R read messages s S messages which contain S in subject se # messages whose score is equal to # points sg # messages whose score is greater than # points sl # messages whose score is lower than # points Se # messages whose size is equal to # bytes Sg # messages whose size is greater than # bytes Ss # messages whose size is smaller than # bytes t S messages which have been sent to S tg S messages with tags contain S tagged messages which have tag(s) T marked messages U unread messages v H V messages which contain V in header H x S messages which contain S in References header x "cmd args" messages returning 0 when passed to command - %F is message file & logical AND operator | logical OR operator ! or ~ logical NOT operator % case sensitive search # match using regular expressions instead of substring search all filtering expressions are allowed, but cannot be mixed through logical operators with the expressions above It is possible to use logical operators AND (&), OR (|) and NOT (! or ~). Case sensitive search is achieved with %. Examples: T marked messages U unread messages f "john beavis" messages from john beavis %f "John Beavis" messages from John Beavis (case sensitive) ~s foo messages which do not have foo in the subject f foo & ~s bar messages from foo that do not have bar in the subject 6. Custom toolbar ----------------- /Configuration/Preferences/Customize Toolbars lets you define the toolbar you want. The configuration dialog enables you to set an icon, an appropriate text, and map an action to it. Actions to choose from are predefined. You can also have your "Claws Mail Actions" (refer to "Actions" above) on your toolbar. Example: * Configuration->Actions - add an entry "Dillo: dillo %p&" * Configuration->Custom toolbar - select Claws Mail Actions Feature - select "Dillo: dillo %p&" from drop down list - choose an icon and click ok 7. Partial downloading of POP3 mails ------------------------------------ Messages over the configured size limit, (/[Account preferences]/ Receive/Message size limit), will be partially retrieved. These messages will have a Notice View displayed (above the Message View), informing of the partially retrieved state and the total size of the message. The Notice View will also contain two buttons, 'Mark for download' and 'Mark for deletion'. If the user clicks 'Mark for download', the message will be downloaded in full at the next message retrieval, (and the partial one deleted); if the user checks 'Mark for deletion' it will be removed from the server after the normal delay as specified in the POP3 account's 'Receive' preferences. If a user moves a partially retrieved message to the Trash folder it will be deleted on the server at the next retrieval after the Trash folder has been emptied. 8. Hidden options ----------------- There's several options which are not widely used and were not added to the configuration interface to avoid excessive bloat. The complete and up to date list of hidden options can be found on Hidden preferences section of Claws Mail Manual: https://www.claws-mail.org/manual/claws-mail-manual.html#adv_hidden 9. Tools -------- Tools are small scripts which can help integrate Claws Mail with other programs; perform format conversions between different kinds of mailboxes, address books, etc.; be used in Claws Mail Actions for a variety of purposes; or used in other programs to ease their interoperability with Claws Mail. You will find all the tools in the 'tools' directory and a detailed description of the available scripts in 'tools/README.' 10. How to contribute --------------------- You are encouraged to send patches via the Claws Mail bugzilla at https://www.thewildbeast.co.uk/claws-mail/bugzilla/index.cgi But please first read the patch guidelines here: https://www.claws-mail.org/devel.php If that's too troublesome, either contact Paul Mangan <paul@claws-mail.org> or consider posting to the Claws Mail-users mailing list. https://www.claws-mail.org/MLs.php Bugs can be reported with Claws' bugzilla at: https://www.thewildbeast.co.uk/claws-mail/bugzilla/index.cgi Of course, you can also post to the Claws Mail-users mailing list. Also, we really try to incorporate good contributions, but sometimes we don't have enough time. If the contribution is really big, or requires a long time to stabilise, send a mail to Paul Mangan <paul@claws-mail.org>. We can probably arrange access to the Claws Mail Git repository. 11. How to request features --------------------------- Ask around in Claws Mail-users ML. Note that some developers may have already thought about your feature and may, perhaps, be implementing it, or the feature was already discussed and rejected for whatever reason. You might want to go ahead and hack a patch for it. (That would be very cool!) Another possibility is to add a request to our bugzilla, (severity: 'enhancement'), at https://www.thewildbeast.co.uk/claws-mail/bugzilla/index.cgi 12. Installing Claws Mail from Git -------------------------------------- a. Downloading -------------- To download the latest Git, cd to the directory where you wish to download to and type the following information: git clone https://git.claws-mail.org/readonly/claws.git Later, when you want to update your local repository, you'll just have to go back to the 'claws' directory, and type: git pull --all b. Installing ------------- To compile and install use the following commands: ./autogen.sh [add configure options as required] make make install [as root] You will need a full set of development tools installed to be able to run autogen.sh. See also ac/README. 13. Release History ------------------- GTK 3 Version ------------- 2023-11-20 4.2.0 2022-10-20 4.1.1 2022-04-03 4.1.0 2021-07-10 4.0.0 GTK 2 Version ------------- 2023-11-20 3.20.0 2022-10-20 3.19.1 2022-04-03 3.19.0 2021-07-10 3.18.0 2020-10-19 3.17.8 2020-09-28 3.17.7 2020-07-13 3.17.6 2020-02-23 3.17.5 2019-07-26 3.17.4 2018-12-22 3.17.3 2018-12-14 3.17.2 2018-08-26 3.17.1 2018-08-15 3.17.0 2017-12-17 3.16.0 2017-08-29 3.15.1 2017-03-26 3.15.0 2016-11-06 3.14.1 2016-08-07 3.14.0 2016-01-19 3.13.2 2015-12-20 3.13.1 2015-10-11 3.13.0 2015-07-19 3.12.0 2014-10-27 3.11.1 2014-10-20 3.11.0 2014-06-09 3.10.1 2014-05-26 3.10.0 2013-12-14 3.9.3 2013-06-08 3.9.2 2013-05-06 3.9.1 2012-11-14 3.9.0 2012-06-27 3.8.1 2011-12-16 3.8.0 2011-08-27 3.7.10 2011-04-09 3.7.9 2010-12-04 3.7.8 2010-11-19 3.7.7 2010-05-01 3.7.6 2010-01-31 3.7.5 2010-01-08 3.7.4 2009-10-09 3.7.3 2009-07-03 3.7.2 2009-03-06 3.7.1 2008-12-19 3.7.0 2008-10-10 3.6.1 2008-10-03 3.6.0 2008-06-27 3.5.0 2008-04-18 3.4.0 2008-02-23 3.3.1 2008-02-08 3.3.0 2007-12-17 3.2.0 2007-11-19 3.1.0 2007-10-02 3.0.2 2007-09-17 3.0.1 2007-09-03 3.0.0 2007-07-02 2.10.0 2007-05-08 2.9.2 2007-04-19 2.9.1 2007-04-16 2.9.0 2007-03-06 2.8.1 2007-02-26 2.8.0 2007-01-26 2.7.2 2007-01-15 2.7.1 2007-01-08 2.7.0 2006-12-04 2.6.1 [first release as Claws Mail] 2006-11-06 2.6.0 2006-10-19 2.5.6 2006-10-12 2.5.5 2006-10-11 2.5.4 2006-10-04 2.5.3 2006-09-26 2.5.2 2006-09-26 2.5.1 2006-09-25 2.5.0 2006-07-31 2.4.0 2006-06-20 2.3.1 2006-06-12 2.3.0 2006-06-08 2.2.3 2006-06-06 2.2.2 2006-06-05 2.2.1 2006-05-08 2.2.0 2006-04-17 2.1.1 2006-04-05 2.1.0 2006-01-30 2.0.0 2005-11-08 1.9.100 2005-10-31 1.9.99 2005-10-03 1.9.15 2005-09-05 1.9.14 2005-07-22 1.9.13 2005-06-27 1.9.12 2005-05-19 1.9.11 2005-05-09 1.9.9 2005-03-18 1.9.6 GTK 1 Version ------------- 2005-06-27 1.0.5 2005-05-09 1.0.4a 2005-03-24 1.0.4 2005-03-10 1.0.3 2005-02-08 1.0.1 2005-01-17 1.0.0 2004-12-06 0.9.13 2004-09-27 0.9.12b 2004-08-23 0.9.12a 2004-06-28 0.9.12 2004-05-31 0.9.11claws 2004-03-08 0.9.10claws 2004-02-06 0.9.9claws 2003-12-19 0.9.8claws 2003-11-26 0.9.7claws 2003-10-02 0.9.6claws 2003-09-10 0.9.5claws 2003-08-04 0.9.4claws 2003-07-12 0.9.3claws 2003-05-24 0.9.0claws 2003-03-12 0.8.11claws 2003-02-12 0.8.10claws 2003-01-24 0.8.9claws 2002-12-26 0.8.8claws 2002-12-23 0.8.7claws 2002-11-25 0.8.6claws 2002-10-07 0.8.5claws 2002-09-22 0.8.3claws 2002-08-28 0.8.2claws 2002-07-30 0.8.1claws 2002-07-23 0.8.0claws 2002-06-15 0.7.8claws 2002-05-18 0.7.6claws 2002-04-28 0.7.5claws 2002-03-11 0.7.4claws 2002-02-19 0.7.2claws 2002-02-14 0.7.1claws 2002-01-14 0.7.0claws 2001-12-16 0.6.6claws 2001-10-16 0.6.5claws8 2001-09-30 0.6.2claws 2001-08-14 0.6.1claws 2001-07-13 0.5.1claws 2001-07-01 0.5.0claws3 2001-06-16 0.4.99claws 2001-05-29 0.4.99claws3 2001-05-11 0.4.67claws1 14. Useful links ---------------- Homepage https://www.claws-mail.org/ User Contributed FAQ https://www.claws-mail.org/faq/ Downloads https://www.claws-mail.org/releases.php Release Announcement Feed https://www.claws-mail.org/releases.rss Latest Release Notes https://www.claws-mail.org/news.php Other Downloads https://www.claws-mail.org/downloads.php List of Plugins https://www.claws-mail.org/plugins.php Icon Themes https://www.claws-mail.org/themes.php Mailing Lists https://www.claws-mail.org/MLs.php Users Mailing List archive https://lists.claws-mail.org/pipermail/users/index.html Commits Announcement List archive https://lists.claws-mail.org/pipermail/commits/index.html Bug/Patch/Feature Request Tracker https://www.thewildbeast.co.uk/claws-mail/bugzilla/index.cgi Internationalisation Status https://www.claws-mail.org/i18n.php Donations https://www.claws-mail.org/sponsors.php Claws Mail for Windows homepage https://www.claws-mail.org/win32/