Tutanota is a free and open source web-mail client that focuses on privacy and security. It has open source iOS and an Android apps. The Android app is published on F-Droid (which means the app does not use Google's push notification system) making it a great option if you...
Mailbox.org offers a secure e-mail account for home and business use. The domain name, email@example.com, is easy to remember and can be understood anywhere in the world. They have been operating e-mail accounts for more than 20 years and are a highly reliable service provider.
ShazzleMail is the first privacy-protective and surveillance-resistant secure email service. ShazzleMail doesn’t travel the web, but delivers mail directly from your smartphone. No server copies, no open access to NSA, and no big business data mining.
Lockbin is a web application for sending private email messages and files. People use it to send things like credit card numbers or confidential information.
SCRYPTmail is true end-to-end encrypted email service. Email and meta data, i.e sender / recipient are encrypted when you communicate within scryptmail domain.Discontinued
Service closing, see https://blog.scryptmail.com/discontinuing-of-service/
Encrypting email with Encipher.it is a simple way to protect your sensitive data. You can encrypt emails or text messages and only the recipient can decrypt it with correct password. Encipher.it integrated with Gmail and many other web applications.
EveryCloud’s cloud based spam filtering service blocks 99.99% of spam, viruses and even newsletters if required. Set spam reports to give users control and view 90 days logs of all inbound and outbound email.
Secure Exchanges is a SaaS that enables point-to-point encrypted email exchange without the recipient having to install anything. It allows you to send emails and files up to 2.5 G. It also allows you to receive information.