PostfixAdmin gives you a Symfony2's based modern interface to manage your Postfix server.
See Symfony2 requirements to use this application.
Get the latest version :
cd /directory/to/install
git clone https://github.com/delormejonathan/PostfixAdmin.git -b v1.0.0
Run the installer, it will ask you some parameters (databases, smtp) :
chmod +x install.sh
./install.sh
You will be able to access to the interface.