Remailing and arbitrage opportunities for e-commerce goods (E-format items) have been identified as a new phenomenon following the introduction by the Istanbul Congress (as of 2018) of the threshold for sampling and differences in E-format rates. This phenomenon is similar to bulk mail for letters; however, it needs to be dealt with separately. The definition of bulk mail needs to be expanded. Furthermore, it is proposed to add the definition currently in the Convention to the Regulations, to give the POC the opportunity to react quickly to new trends. The Istanbul Congress created a more cost-covering and equitable terminal dues system for e-commerce items exchanged between countries in groups I, II and III which carry out billing on the basis of a rate per kilogramme and a rate per item.