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.
GNOME Evolution
gitlab.gnome.org/GNOME/evolution/-/wikis/home
Our take
Evolution is the natural choice for GNOME desktop users who want a full PIM without piecing together separate apps: mail, calendar, and address book share a common data layer, so a meeting invite in your inbox lands directly in your calendar. Native OpenPGP support means no Enigmail workaround needed. The downside is that the interface shows its age, the Exchange/EWS connector is a separate package, and it is strictly a Linux application with no mobile or Windows counterpart. Best suited to GNOME users already comfortable on the desktop who need an integrated, privacy-respecting alternative to Outlook.
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GNOME Evolution alternatives
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Kontact 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.
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…