The use of mailbox is no stranger in Malaysia and around the world. However, there are some mailbox that do not have detector in the mailbox and make it difficult to the owner. This has caused concern among the households. So, we placed and built in a device that could solve the problem. This project was created in prototype form. This "smart mail detector" project was created to ensure that each household are in a good condition easy for the owners to get notify. The objective of this project is to change a normal mailbox with functions to facilitate users. The problem that we try to solve is to placed a device inside the mailbox that normally hanging outside of the house. The main purpose of this project is to fix every household mailbox that using manual method weather the owner must check the mailbox every single time that there thing about the envelopes in it. We find a way to create a simple way for every household especially for domestic mailbox. In the form of this prototype Arduino Uno plays an important role of the system to control all systems. In short, it will help each owner of the house to get notify with the device that connected with the wifi and solar that generate current to the battery and directly to the device to turn it on.