What is the Secure Electronic Postal Box application, how does it work?

According to the introduction of Correios e Telecomunicacoes de Macau, Secure Electronic Postal Box is a Productivity app on the Android platform. There is currently a 1.3.6 version released on May 07, 2017, you can see the details below.

"Secure Electronic Postal Box" abbreviated as "SEPBox", it is a FREE electronic postal box application offered by CTT. After user is authenticated and registered, a free SEPBox will be offered so that user could safely receive government electronic notifications, Postal Registered electronic Mail, electronic bill and electronic subscription, avoiding junk mail and virus email. In addition, reminders are automatically set with electronic delivery, ensuring important electronic bills or activities will not be forgotten. Furthermore, user has freedom to opt-in or opt-out any electronic subscription and receives selected special offer, discounts and information.

What's new in version 1.3.6 - Information Update