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
Official website 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
StartMail First choice for privacy email accounts. Users can choose between their web client or third party desktop clients like Thunderbird. Unlimited aliases with the StartMail and…
ProtonMail Free and paid plans include all security features, including end-to-end encryption, zero-access encryption, anti-phishing, anti-spam and 2FA. Own Android, iOS Apps and web…
Tuta Tuta: Free, Cross-Platform and Zero-Knowledge Calendar
SimpleLogin Emails are forwarded to your real email address. If you reply to a sender it will use your alias, too. It is designed to be user friendly and available on many platforms. Based…
addy.io addy.io is an open-source email aliasing service that lets you create unlimited aliases forwarding to your real inbox. Available on web, browser extensions for all major browsers, and Android/iOS apps. Self-hostable. Based in the United Kingdom.
mailbox.org Paid plans enable custom domains. Users can choose between their web client or third party desktop clients like Thunderbird. Based in Germany, founded in 2014.