The most popular alternative is Tutanota. It's not free, so if you're looking for a free alternative, you could try SCRYPTmail or Lockbin. If that doesn't suit you, our users have ranked 11 alternatives to Sfletter so hopefully you can find a suitable replacement. Other interesting Sfletter alternatives are mailbox.org (Paid), Shazzlemail (Free Personal), Encipher.it (Free, Open Source) and Runbox (Paid).
- 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.
- mailbox.org offers a secure e-mail account for home and business use. The domain name, firstname.lastname@example.org, is easy to remember and can be understood anywhere in the world.
- ShazzleMail is the first privacy-protective and surveillance-resistant secure email service.
- 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.
- 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.
- Encrypting email with Encipher.it is a simple way to protect your sensitive data.
- (Official description) Runbox provides secure email communication with Perfect Forward Secrecy SSL connections, Extended Validation, and options for...
- EveryCloud’s cloud based spam filtering service blocks 99.99% of spam, viruses and even newsletters if required.
- 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.
- Secure email made simple