Intranet mailing system project is implemented in java you can free download this project. This application can be used inside any organization for communication between employees.
This application has all features as that of normal mailing software like chatting, sending and receiving mails and users can create groups, add delete and remove members from group.
And the user is provided with all security issues like email hacking inside the organization by another employee.
For every organization there is need to use self mailing system which will keep content secured and moving out the company. There are many mailing applications like squirrel mail ..etc which are similar to this application.
You can download entire project source code and project execution details.