Apps similar to Egress Switch Secure Email and File Transfer include Quatrix. It's paid, but MeSign is free. Other options are Symantec Desktop Email Encryption. In total there are three Email Clients like Egress Switch Secure Email and File Transfer for Windows, Linux, the web, Android and iPhone.
Quatrix® is a secure, easy-to-use, and compliant file sharing product for enterprise. Quatrix offers centralised granular administration, vast security, rich audit, manual and automated workflows, world-class Customer Support, and good value.
United Kingdom
Desktop Email Encryption provides an end-to-end email encryption solution that automatically encrypts and decrypts email directly from one user's client to another's without the need to log into a third-party website or by other means.
MeSign is a free email encrypted client. Once you log in to your email account with MeSign App, the free S/MIME certificates will be issued, installed and configured automatically. The users can start to encrypt within 3 minutes.
China
