World Library  
Flag as Inappropriate
Email this Article


Article Id: WHEBN0000356954
Reproduction Date:

Title: Kmail  
Author: World Heritage Encyclopedia
Language: English
Subject: Spell checker, Hypermail
Publisher: World Heritage Encyclopedia


Developer(s) KDE
Stable release 4.11.3 (5 November 2013; 8 months ago (2013-11-05)) [±][1]
Written in C++
Operating system Unix-like
Type Personal Information Manager
License GNU General Public License

Kontact is a personal information manager and groupware software suite developed by KDE. It supports calendars, contacts, notes, to-do lists, news, and email. It offers a number of inter-changeable graphical UIs (KMail, KAddressBook, Akregator, etc.) build on top of a common core.

Differences between “Kontact” and “KDE PIM”

Technically speaking, Kontact only refers to a small umbrella application that unifies different stand-alone applications under one user interface. KDE PIM refers to a work group within the larger KDE project that develops the individual applications in a coordinated way.

In popular terms, however, Kontact often refers to the whole set of KDE PIM applications. These days many popular Linux distributions such as Kubuntu hide the individual applications and only place Kontact prominently.


KDE PIM New Year Meeting
Year Date
2003 1/3-1/5
2004 1/2-1/5
2005 1/6-1/9
2006 1/6-1/8
2007[2] 1/12-1/15
2008[3] 2/1-2/3
2009 1/09-1/11
2010[4] 1/8-1/10
2011[5] 2/25-2/27

The initial groupware container application was written in an afternoon by Matthias Hölzer-Klüpfel and later imported into the KDE source repository and maintained by Daniel Molkentin. This container application is essential for Kontact to operate, but without embedded components is not useful by itself.

The first embedded components were created by Cornelius Schumacher. He modified the KAddressBook and KOrganizer applications to create the initial address book and organizer components. At this stage no mail client component existed so KDE still lacked a functional integrated groupware application. However Cornelius' groundbreaking work acted as a prototype for other developers to base their efforts on.

Don Sanders created the missing mail client component by modifying the KMail application. He then integrated the mail client component with the other components, and the groupware container application, assembled and released the initial Kontact packages, and created the initial Kontact website.

Daniel Molkentin, Cornelius Schumacher and Don Sanders then formed the core Kontact team. The KMail and container application changes were imported into the KDE source repository, and Kontact was released as part of KDE 3.2.[6]

During the construction of the Kontact application suite, the Kolab groupware server was being worked on by Erfrakon,[7][8] and Klarälvdalens Datakonsult[9] simultaneously and was completed at approximately the same time. This work was done as part of the Kroupware[10] project that also involved modifying the KMail and KOrganizer applications to enhance them with additional groupware features.

The core Kontact team, the Kolab consortium, and several independent KDE PIM developers then worked together to enhance Kontact by integrating the Kroupware functionality and making Kolab the primary Kontact server.

Additionally a news component was created from the KNode application by KDE developer Zack Rusin, and Kontact was modified to support an array of mainly web based suites of collaboration software.


Kontact embeds the following

  • Summary Page: Shows unread email, upcoming appointments, the latest news and weather


Stable release 1.13

KMail supports folders, filtering, viewing HTML mail, and international character sets. It can handle IMAP, IMAP IDLE, dIMAP,[11] POP3, and local mailboxes for incoming mail. It can send mail via SMTP or sendmail. It can forward HTML mail as an attachment but it cannot forward mail inline.[12]

Spam and filtering

KMail uses two special filters to provide a modular access to spam-filtering programs:

  • Send this e-mail to a program allows any program to be specified, and when that KMail filter is activated, the program will be run and supplied with the contents of the e-mail as its standard input.
  • Pipe this e-mail through a program not only sends the e-mail to a specified program, but replaces the e-mail with the output of that program. This allows the use of systems such as SpamAssassin which can add their own headers to a piece of e-mail.

These modular filters can be combined with text filters to detect (for example) e-mail which has been flagged by SpamAssassin by looking for the special headers it added.

KMail allows manual filtering of spam directly on the mail server, a very interesting feature for dial-up users. Emails that exceed some threshold size (standard is 50 kb, but it may be set to any value) are not automatically copied to the local computer. With "get, decide later, delete" options, KMail lists them but does not download the whole message, which allows the deletion of spam and over-sized messages without wasting time.

Cryptographic support

KMail supports the OpenPGP standard and can automatically encrypt, decrypt, sign, and verify signatures of email messages and its attachments via either the inline or OpenPGP/MIME method of signing/encryption. KMail depends on GnuPG for this functionality. As a visual aid, KMail will colour verified email messages green for trusted signatures; yellow for untrusted signatures; red for invalid signatures; and blue for encrypted messages.

KMail also supports S/MIME messages as well as Chiasmus,[13] a proprietary cryptographic system created by the German Federal Office for Information Security (BSI).

Address Book


KAddressBook is an address book software application made for the K Desktop Environment.


KAddressBook is a graphical interface to organizing the addresses and contact information of family, friends, business partners, etc. It integrates with KDE, allowing interoperability with other KDE programs, including the e-mail client KMail – allowing one-click access to composing an e-mail – and the instant messenger Kopete – showing the online status of and easy access to instant messaging contacts. It can be synchronized with other software or device using Kitchensync and OpenSync.

A contact may be classified into customizable categories, such as Family, Business, or Customer. Many of the fields can have multiple entries, for example, if the contact has several e-mail addresses. A contact's fields are separated into four tabs and one tab for custom fields.


  • Exports and imports cards to and from vCard format.
  • Uses DBUS to interface with other applications.
  • Interoperable with KMail and Kopete, as well as Kontact.
  • Customize fields and categories.
  • Automatic formatting of names.
  • Filter ability, to search for addresses.
  • Capability to query an LDAP database containing person information.


KOrganizer’s Calendar view

KOrganizer is the personal organizer of the KDE desktop environment. It has the ability to manage calendars, journals, and a to do list.

News Feed Aggregator

Stable release 1.6

Akregator is an open source feed aggregator. It supports both RSS and Atom. Feeds can be sorted into categories. Akregator will aggregate all feeds in a particular category into a single list of new entries so that, for example, all news in the category "Politics" can be shown in one list. It has an incremental search feature for the titles of all the entries in its database.

Akregator can be configured to fetch feeds within regular intervals. The user can also manually request to fetch all feeds, individual ones, or those in a selected category. It supports feed icons and embeds KHTML as an internal, tabbed web browser. Any external browser can also be called.

Akregator is part of KDE since the 3.4 release, and it is distributed with the kdepim module.

Usenet News Client

Stable release 4.3.0

KNode is a free news client program for the KDE desktop environment.

It supports multiple NNTP servers, message threads, scoring, X-Face headers (reading and posting), and international character sets.

Other components

  • Notes: KNotes - KDE Notes Management
  • Weather: KWeather

Storage back-end

Main article: Akonadi

Along with the KDE 4 life cycle, Kontact moves to Akonadi for storing its data, when in the past every Kontact component implemented the storage technologies itself. Akonadi is currently mostly developed by the KDE PIM team, but its design is done in an agnostic way and thus not depending on KDE technologies.

The first KDE 4 release of Kontact was officially shipped with KDE 4.1. That release did not use Akonadi. Since then the Kontact components have been gradually migrating towards Akonadi. The first stable version of KDE PIM using Akonadi has been released together with KDE 4.6.4 in June 2011.[14]

See also


This article was sourced from Creative Commons Attribution-ShareAlike License; additional terms may apply. World Heritage Encyclopedia content is assembled from numerous content providers, Open Access Publishing, and in compliance with The Fair Access to Science and Technology Research Act (FASTR), Wikimedia Foundation, Inc., Public Library of Science, The Encyclopedia of Life, Open Book Publishers (OBP), PubMed, U.S. National Library of Medicine, National Center for Biotechnology Information, U.S. National Library of Medicine, National Institutes of Health (NIH), U.S. Department of Health & Human Services, and, which sources content from all federal, state, local, tribal, and territorial government publication portals (.gov, .mil, .edu). Funding for and content contributors is made possible from the U.S. Congress, E-Government Act of 2002.
Crowd sourced content that is contributed to World Heritage Encyclopedia is peer reviewed and edited by our editorial staff to ensure quality scholarly research articles.
By using this site, you agree to the Terms of Use and Privacy Policy. World Heritage Encyclopedia™ is a registered trademark of the World Public Library Association, a non-profit organization.

Copyright © World Library Foundation. All rights reserved. eBooks from Project Gutenberg are sponsored by the World Library Foundation,
a 501c(4) Member's Support Non-Profit Organization, and is NOT affiliated with any governmental agency or department.