A method of electronically consolidating mail items between a plurality of senders and a postal administration, including consolidating files received from senders into a single consolidation file; each file containing a unique identity code and an address of a destination of each mail item; 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, each mail item being affixed with the unique identity code for the purpose of identifying both the sender and the mail item; receiving, via a wireless telecommunications network, said unique identity code borne by each mail item; taking delivery of the mail items and printing a bar code onto each of them; and sending the single consolidation file to a server of the postal administration and handing over the mail items to a collection office of the postal administration.