AOL Mail (Aol Mail) is a free web-based email service.

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.

Mailvelope is a free software for end-to-end encryption of email traffic inside of a web browser (Firefox or Chromium) that integrates itself into existing we…

Microsoft SharePoint is a browser-based collaboration and document management platform.

Enigmail is a data encryption and decryption extension for Mozilla Thunderbird and the SeaMonkey internet suite that provides OpenPGP public key e-mail encryp…

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

Kopano is an open-source groupware application suite originally based on Zarafa.

Mailpile is a webmail client with encryption and privacy features built-in. Mailpile is free and open-source software.

Microsoft Exchange Server is a mail server and calendaring server.

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