Inbox.lv - Inbox.lv Mail
ProtonMail - Secure email with absolutely no compromises. Get your free encrypted email account today.
CounterMail - Countermail is a web-based email service. It is hosted in Sweden. Its focus is on privacy.
Enigmail - Security extension to Mozilla Thunderbird and SeaMonkey
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Mailvelope - Mailvelope open source project. OpenPGP in your browser.