KMail

What KMail is

KMail is a free Linux desktop email client and the email component of Kontact, KDE’s personal information manager. It supports POP3, IMAP, Microsoft Exchange (EWS), and other email protocols, with a unified inbox and offline use when mail is synced locally. Security options include built-in OpenPGP and S/MIME end-to-end encryption, as well as SSL/TLS transport encryption. KMail isolates HTML content to prevent hidden external references and warns about suspicious links. Organization tools include filtering, local and remote search, tags, and mailing-list management. The composer has templates, text snippets, forgotten-attachment warnings, attachment compression, and image resizing. It connects with KOrganizer for meeting invitations and KAddressBook for address completion and related details. Other listed features include scheduled sending, IMAP IDLE push email, and Sieve server-side filtering. Optional translation and speech-to-text features are disabled by default. KMail is listed under the GPL-2.0+ license; KDE lists its handbook, forum, user mailing list, and Libera.Chat channel as help options.