Delta Chat
Following a suggestion in another Register thread, I installed Delta Chat from the F-droid store.
Essentially, it's an easy to use front end to encrypted emails, using an interface similar to Whatsapp, so provides end to end encryption. Since it uses email addresses rather than phone numbers to identify contacts, it can also be used to communicate as a normal email app.
Currently, usable beta versions are available for several platforms.
Worth a look, you might be impressed.
Biting the hand that feeds IT
