The ET mailing lists are based on the central INFN mail list server. You have to add to the following names the text ""

name description
et-loi ET letter of intent signatories (current general ET mailing list)
et-loi-italia Italian signatories of the ET LOI
et-sardegna coordination of the ET activities in Sardinia
et-steering ET steering committee
et_3d_design team designing the ET infrastructure
et_italia_coordinatori coordinators of the INFN ET "sigla"
etsites Team defining the qualification parameters for the ET sites