A secure electronic correspondence method and system based on a principle relating to the uniqueness of the originals of the correspondences. The archiving thereof is certified by a certification service provider and performed by an archive operator in an electronic safe box. The main steps of the processes for processing said correspondences are the subject of a report confirming the correct execution thereof, including the return of a certification token by the operator responsible for the step to the managers of the trust chain. In a variant, correspondences belonging to a document management series can only be sent if they meet management rules set for the series. In a privileged mode, functions of the electronic correspondence operators that do not necessarily have to meet user proximity requirements can be grouped together into shared service centers within which the communications are reduced without negatively affecting the reliability of the process.