Letterbox

You get free access to an usable end-to-end encryption mail client on iOS (Letterbox) and in return we ask you to support us to understand and to improve secure communication. We do not provide any incentive or compentsation to participate in our short study but you can be part of improving secure communication.

What do you have to do?

• Register yourself and install Apple's TestFlight.
• Install TestFlight and Letterbox on your iPhone
• Use your personal mail account to set up Letterbox.
• Read and response to our welcome mail.
• Answering our short online survey and share you experience with Letterbox or end-to-end encryption.
• Use Letterbox how ever you like.

What do we offer?

• We offer a free and open source mail client on iOS for end-to-end encrypted mail.
• We only collect some meta data to understand mail use in the field.
• We ask for your opinion and your experience of end-to-end encrypted mail communication and Letterbox.

You can find a more detail overview here. When using Letterbox we are collecting meta data. Please read the privacy policy for more information.

Letterbox is a research project and still under development. At the moment, we can only offer a beta version and this version may contain bugs or other errors.

Please use Letterbox only at your own risk!