PostfixADM is a web based interface used to manage mailboxes, virtual domains and aliases. It is designed be highly flexible and should fit on any setup.
For a basic setup isn't much required but you should make sure that the following is installed / available:
PostfixADM is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version.
If you make changes to it, or fix bugs, please consider donating your changes back to the community.