Claws Mail (previously known as Sylpheed-Claws) is a
configurable email client and news reader based on the GTK+ GUI
toolkit, and it runs on the X Window System.
This package contains header files for building plugins.
Provides
Requires
License
GPL-2.0-or-later
Changelog
* Tue Mar 10 2026 Carsten Ziepke <kieltux@gmail.com>
- Update to 4.4.0:
* Several updates to strings and icons.
* The word 'Write' is now used in place of 'Compose'.
e.g. 'Write email'; 'Write' preferences page, etc.
* Hide Message List's horizontal scrollbar by default if not
using GENERIC_UMPC.
* Added a new hidden preference, 'mainwin_toolbar_always_enable_actions',
(turned off by default). Activating this option means that toolbar
items bound to user Actions (in the main window) will be active even
when no messages are selected.
* Navigation using the numpad arrow keys is now possible.
* A new Colour preference has been added: 'Messages marked for moving
or deletion'. This is used when 'execute immediately' is switched off.
* Compose window: When re-editing a drafted message, the user will now
be prompted to save any changes made to the message headers.
* Compose window: when the contents of a header field are cleared, the
Clear button becomes a Delete button, enabling the now empty row to
be removed completely.
* Folder properties: two new options to handle HTML content have been
added to the General page:
'Render HTML messages as text' and 'Render HTML messages with plugin
if possible'.
* Folder properties: a new option, 'Show tags' has been added. This
controls whether any message tags are displayed at the top of the
Message View.
* SpamAssassin: updated third-party code to 4.0.1.
* Mail Archiver: added support for Zstandard compression (zstd)
(libarchive >= 3.4.0 required).
* RSSyl: the default User-Agent string has been changed to
ClawsMailRSSyl/$VERSION ($URL); this can be changed in the plugin's
preferences, and can be further set on a per-feed basis on the
'Feed properties' page.
* RSSyl: added a preference so that feeds configured for manual
updates only are not updated when refreshing all feeds (recursively
by the context menu, timer or at start-up, if enabled).
* RSSyl: store and send ETag and Last-Modified headers.
* RSSyl: postpone auto-updates if the server sends a Retry-After:
header. A successful manual update clears the Retry-After value.
* PGP: display a specific message, ("This key is not in your
keyring") in the NoticeView area when a key is not in the keyring.
* PGP: added an option to automatically locate missing keys when
sending encrypted messages.
* PGP: a missing key can now optionally be retrieved by clicking the
NoticeView icon.
* PGP: added a 'Search for PGP key' context menu item to email
addresses in the Message View.
* Notification: Ayatana indicator can now be configured to limit
notifications to certain folders only.
* Notification: added 'Open address book' entry to Ayatana indicator's
tray menu.
* Configuration is now stored in a dedicated file: oauth2rc, located
in the configuration directory. This file allows a user to
accommodate an API change by a service provider, or to add a completely
new Oauth2-based email provider of their choice. Setting protected=1
within an edited or bespoke block protects it from being overwritten
by a new version of Claws Mail.
* GnuTLS >= 3.4.0 is now the minimum requirement.
* libetpan >= 1.9.4 is now the minimum requirement.
* dbus-glib support has been migrated to GDBus (GIO) >= 2.26
and D-Bus (>= 0.60).
* The summary of the configure output has been completed.
* A new hidden preference has been added: "show_contact_pic".
When viewing a message, if the sender is in your address book and
you have saved a picture for the contact there, this option will
display that picture unless the Header Pane is displayed or you
have chosen not to d