Hexmail.cc is a free email application available for Android devices developed by OldMaid. It offers additional features such as spam protection and end-to-end encryption. The spam protection feature is achieved by allowing each contact to use a different email address. This means that if one of the email addresses is added to a spam list, it can be deleted without affecting your other email addresses.

The second feature, encryption, is accomplished by using a public key as the email address. This allows for end-to-end encryption, ensuring that your email communication is secure. Currently, encryption is only supported within the Hexmail.cc network, but it is a step towards a future where all email can be secure. Hexmail.cc is easy to use and offers a glimpse of the future of email communication.