Kontact is the KDE personal information management suite that combines KMail (email), KOrganizer (calendar), KAddressBook, and a feed reader into a single unified window. It runs on Linux and supports IMAP, POP3, OpenPGP, and S/MIME natively.
Kontact
kontact.kde.org
Our take
Kontact is the KDE counterpart to GNOME Evolution: a fully integrated Linux PIM where each component (KMail, KOrganizer, KAddressBook) can also be run standalone, which gives it more flexibility than it might look like on first glance. OpenPGP and S/MIME are built in, CalDAV/CardDAV sync works out of the box, and the Akonadi backend handles large mail accounts without blocking the UI. The honest catch is that Akonadi is a heavyweight dependency that can be tricky to configure and occasionally needs a manual database reset. Best for KDE Plasma users who want a privacy-respecting Outlook replacement rather than a minimalist client.
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Kontact alternatives
Browser - Mailvelope Bring email encryption straight into your Browser. We recommend using Firefox for this. It can be used to encrypt and sign electronic messages, including attached files,…
GNOME Evolution GNOME Evolution is a Linux personal information manager combining email, calendar, contacts, and tasks in one application. It uses standard protocols (IMAP, SMTP, CalDAV, CardDAV) and supports native OpenPGP and S/MIME encryption without plugins.
NeoMutt NeoMutt is a command-line email client for Linux and macOS, forked from Mutt with a large collection of patches and added features. It supports IMAP, POP3, SMTP, OpenPGP, S/MIME, Notmuch search integration, and is highly configurable via a plain-text config file.
FairEmail FairEmail is a fully featured, open-source email client for Android that uses standard IMAP/SMTP protocols and supports OpenPGP and S/MIME encryption. It blocks remote image tracking, confirms link opens, and stores no data on third-party servers.
Desktop - Thunderbird Mozilla Thunderbird is a email client, personal information manager, news client, RSS and chat client.
Android - K-9 Mail K-9 Mail is an open source email client focused on making it easy to chew through large volumes of email. Designed for both novice and power users and offers lots of features…