A method of electronically consolidating mail items between a plurality of senders and a postal administration that handles delivery of said mail items to their destinations, the method comprising the following steps at the premises of each of the senders: affixing a unique identity code to each of the mail items; and creating a consignment file containing the unique identity code and the address of the destination, and sending said file to a remote central server of a third party entity; and the following steps at said server: consolidating the files received from all of the senders into a single consolidation file; sending a collection order to a mail item collection service so that a collection employee collects the mail items to be sent from the various senders, the collection step also including an input step for inputting said unique identity code at input means and a transmission step for transmitting said code to said remote central server, via a wireless telecommunications network; taking delivery of the mail items after the collection and printing a bar code onto each of them for the purpose of facilitating subsequent sorting of them by the postal administration; and sending said single consolidation file to a server of the postal administration and handing over the mail items to a collection office of the postal administration.