KMail
KMail using the default layout: the folder list on the left side and the preview pane below the message list (top right)
Developed by	The KMail Team
Latest release	1.9.9
OS	Unix-like
Genre	E-mail client
License	GNU General Public License
Website	kontact.kde.org/kmail

KMail is the e-mail client of the KDE desktop environment. Image File history File links KMail Application Icon. ... Download high resolution version (1280x978, 203 KB)My Kmail window, showing the Wikipedia mailing list. ... For other uses, see Software developer (disambiguation). ... Code complete redirects here. ... An operating system (OS) is the software that manages the sharing of the resources of a computer and provides programmers with an interface used to access those resources. ... Diagram of the relationships between several Unix-like systems A Unix-like operating system is one that behaves in a manner similar to a Unix system, while not necessarily conforming to or being certified to any version of the Single UNIX Specification. ... This article does not cite any references or sources. ... A software license is a legal agreement which may take the form of a proprietary or gratuitous license as well as a memorandum of contract between a producer and a user of computer software. ... GPL redirects here. ... A website (alternatively, Web site or web site) is a collection of Web pages, images, videos or other digital assets that is hosted on one or several Web server(s), usually accessible via the Internet, cell phone or a LAN. A Web page is a document, typically written in HTML... This article does not cite any references or sources. ... For the NYSE stock ticker symbol KDE, see 4Kids Entertainment. ... Information in this article or section has not been verified against sources and may not be reliable. ...

It supports folders, filtering, viewing HTML mail, and international character sets. It can handle IMAP, dIMAP[1], POP3, and local mailboxes for incoming mail. It can send mail via SMTP or sendmail. HTML, an initialism of HyperText Markup Language, is the predominant markup language for web pages. ... The Internet Message Access Protocol (commonly known as IMAP, and previously called Interactive Mail Access Protocol) is an application layer Internet protocol used for accessing email on a remote server from a local client. ... Post Office Protocol version 3 (POP3) is an application layer Internet standard protocol used to retrieve email from a remote server to a local client over a TCP/IP connection. ... Simple Mail Transfer Protocol (SMTP) is the de facto standard for email transmission across the Internet. ... Sendmail is a mail transfer agent (MTA) that is a well known project of the open source, free software and Unix communities, which is distributed both as free software and proprietary software. ...

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. The standard streams are a set of input and output channels featured in Unix and Unix-like operating systems, and provided by the standard I/O library (stdio. ... SpamAssassin is a computer program released under the Apache License 2. ...

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 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's built-in encryption and signature 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. Download high resolution version (864x631, 78 KB)KMail with encryption The email addresses are deliberately obscured -- this is not part of the encryption! This is a screenshot of copyrighted computer software. ... Download high resolution version (864x631, 78 KB)KMail with encryption The email addresses are deliberately obscured -- this is not part of the encryption! This is a screenshot of copyrighted computer software. ... An Open Specification for Pretty Good Privacy (openpgp) OpenPGP is defined by the OpenPGP Working Group of the Internet Engineering Task Force (IETF) Proposed Standard RFC 2440. ... The GNU Privacy Guard (GnuPG or GPG) is a free software replacement for the PGP suite of cryptographic software, released under the GNU General Public License. ... An Open Specification for Pretty Good Privacy (openpgp) OpenPGP is defined by the OpenPGP Working Group of the Internet Engineering Task Force (IETF) Proposed Standard RFC 2440. ...

KMail also supports S/MIME messages as well as Chiasmus [2], a proprietary cryptographic system created by the German Federal Office for Information Security (BSI). S/MIME (Secure / Multipurpose Internet Mail Extensions) is a standard for public key encryption and signing of e-mail encapsulated in MIME. // S/MIME was originally developed by RSA Data Security Inc. ... Building in Bonn The Bundesamt für Sicherheit in der Informationstechnik (abbreviated BSI - in English: Federal Office for Information Security) is the German government agency in change of managing computer and communication security for the German government. ...

Groupware support

When used as part of the Kontact personal information manager suite, KMail can act as a groupware client, sharing contact lists, e-mail, calendars, and notes between users. Kontact is a personal information manager and groupware software suite for KDE. It supports calendars, contacts, notes, to-do lists, news, and email. ... A personal information manager (PIM) is a type of application software that functions as a personal organizer. ... Collaborative software, also known as groupware, is application software that integrates work on a single project by several concurrent users at separated workstations (see also Computer supported cooperative work). ...

See also

• Comparison of e-mail clients

Image File history File links Free_Software_Portal_Logo. ... The following tables compare general and technical information between a number of e-mail client programs. ...

External links

• KMail Homepage