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Autocrypt is an open standard for end-to-end encryption in e-mail communication. It aims to make secure e-mail communication as easy as possible.
Pretty Good Privacy (PGP) and GNU Privacy Guard (GPG) are widely used tools for e-mail encryption. They offer a high level of...
ProtonMail is an end-to-end encrypted email service based in Switzerland.
Free tier available, premium plans starting at $5/month
Mailvelope is a browser extension for OpenPGP encryption used for secure email communication.
Zimbra is an enterprise-class email, calendar, and collaboration solution built for the cloud, both public and private.
Starting at $6 per mailbox per year
Kolab Now is a secure and private collaboration suite offering email, calendar, file storage, and more.
Starting at $4.99 per month
Tutanota is an open-source end-to-end encrypted email software and freemium hosted secure email service.
Freemium
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