In this free app, you can encrypt your email, photos, and files using a combination of AES and RSA (Public/Private Key). When you receive an email that is encrypted with the correct key, you will be able to decrypt it. You can also create email threads that can only be viewed by the recipient, and manage your email by saving a list of what you have sent.

If you have a lot of emails to download, you can easily download them from your device or online storage and choose to only download them when you need them, which will help save space on your device.