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KMail is the e-mail client of the KDE Desktop Environment.
It supports folders, filtering, viewing HTML mail, and international character sets. It can handle IMAP, POP3 and local mailboxes for incoming mail. It can send mail via SMTP or sendmail.
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Tools
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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.
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Cryptographic support
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KMail has support for OpenPGP e-mail, and will automatically decrypt messages and check the signature once the user has typed their password, displaying such messages within a blue box to show that they were encrypted. Signed messages will be displayed in a green or yellow box, depending on the trust level of the key used to sign (yellow means untrusted, green means trusted). Keep in mind that a message can be both crypted and signed.
When composing an e-mail, Kmail can sign and/or crypt the outgoing e-mail, as well as any individual attachments.
OpenPGP or GnuPG must be installed of the system; if not, these functionalities will not be avaiable. Kmail also has support for S/MIME and Chiasmus, though use of these crypto suites does not seem to be widespread.
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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.
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See also
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