Canary’s security suite is second to none with Seamless End-To-End Encryption, Full PGP Support, Biometric App Lock, On-Device Fetch, No Ads, No Data Mining & Open Source Mail Sync Engine. Also available for Mac.
Canary Mail
canarymail.io
Our take
Canary Mail is the polished, paid mobile client in this group, with built-in PGP and a slick interface that does not feel like a 2009 throwback. The trade is that the encryption engine is the open part while much of the app is not, and you are paying for a closed client rather than an open standard. It fits people on iOS and Android who want encryption to feel easy and are comfortable trusting a commercial vendor to deliver it.
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Canary Mail alternatives
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…
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.
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.
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.