Disroot is an opensource project that provides secure email accounts for your desktop client or via a web interface.

GPGMail is an extension for Apple Mail that provides public key email encryption and signing.

Kolab Now is a web-based email and groupware service, based completely on free and open-source software.

Posteo is an email service provider offering paid email accounts for individuals and businesses.

Tutanota is an open-source end-to-end encrypted email software and freemium hosted secure email service.

Zoho Mail is a email service with ample storage, POP and IMAP access, some integration with instant messaging and online office suites.

FastMail is an email service offering paid email accounts for individuals and organizations.

Hushmail is an encrypted proprietary web-based email service offering PGP-encrypted e-mail and vanity domain service.

Mailfence is a web-based email service that offers OpenPGP based end-to-end encryption and digital signatures.

Soverin is a secure mail hosting platform.

WorkSpace collaborative suite for SMEs.