EU-Commission

The competition and the liberalisation of the postal markets within the Member States is also decisively driven by the EU-Commission.  
For the preparation/transposition of the Directives and the liberalisation, the Directorate General  

DG Growth (Internal Market, Industry, Entrepreneurship, and SMEs)

under the guidance of the Commissioner of DG Growth Mrs. Elżbieta Bieńkowska

European Commission
DG Growth (Internal Market, Industry, Entrepreneurship, and SMEs)
1049 Brussels
Belgium

is responsible.

More Information may be found at the webpage of DG Growth:
http://ec.europa.eu/growth/sectors/postal-services/index_en.htm