eDelivery is a building block maintained by the European Commission that provides technical specifications and standards, installable software and ancillary services to allow projects to create a network of nodes for secure digital data exchange. By building with eDelivery, public and private organisations from different sectors can easily create a safe and interoperable channel to transfer documents and data among each other over a public or private network.
Read more about eDelivery at https://ec.europa.eu/digital-building-blocks/sites/display/DIGITAL/eDelivery.