claws-mail

Claws Mail - a GTK lightweight and fast e-mail client

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Copyright (C) 1999-2024 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 .

For more details see the file COPYING.

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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
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
. 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
-------------
2024-06-10 4.3.0
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
-------------
2024-06-10 3.21.0
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
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