After installing the REDDCRYPT app on your smartphone you are free to use it whenever you want to securely send and receive sensitive information.
Visually the smartphone app is similar to other mail apps in that you have an inbox and an outbox. Emails can be formatted and attachments can be added, of course.
If you already have a REDDCRYPT account you are ready to go. If not, you may create an account within a few seconds.