eDelivery is a network of nodes for digital communications. It is based on a distributed model where every participant becomes a node using standard transport protocols and security policies.
eDelivery helps public administrations to exchange electronic data and documents with other public administrations, businesses and citizens, in an interoperable, secure, reliable and trusted way.
eDelivery is one of the building blocks of the European Commission’s Connecting Europe Facility (CEF). These building blocks are reusable specifications, software and services that will form part of a wide variety of IT systems in different policy domains of the EU.
The CEF eDelivery building block is based on the AS4 messaging protocol, open and free for all, developed by the OASIS standards development organisation. To ease its adoption in Europe, eDelivery uses the AS4 implementation guidelines defined by the Member States in the e-SENS Large Scale Pilot. Organisations must install an Access Point, or use a Service Provider, to exchange information with the AS4 messaging protocol.
What is an eDelivery network
eDelivery works as a collection of distributed nodes that are conformant to the same technical rules, and therefore capable of interacting with each other. eDelivery prescribes technical specifications that can be used in any Policy Domain of the EU (Justice, Procurement, Consumer Protection, etc.) to enable secure and reliable exchange of documents and data (structured, non-structured and/or binary), both across borders and sectors.
As a result, organisations that have developed their IT systems independently from each other can start to securely communicate with one another once they have connected to a eDelivery node.
It is important to note that there is no single eDelivery node per Member State but several ones. Each one of these nodes is deployed for a specific Pan-European Project within a given policy domain: eJustice, eProcurement, etc. Typically, the nodes of eDelivery are uni-domain and uni-project.
https://ec.europa.eu/cefdigital/wiki/display/CEFDIGITAL/What+is+eDelivery+-+Overview