Understanding reserved fields

Some fields are reserved on Contactly. It is therefore impossible to name columns in the following way:

 "IDU_EMAIL"
    "ID_MAILING"
    "DCALCUL"
    "ID_TYPECONSENTEMENT"
    "ID_TYPOLOGY"
    "ID_VERSION"
    "GRP_TEMOIN"
    "SEGMENT"
    "MM_SENDER_DOMAIN"
    "IDU_TELMOBILE"
    "ID_MAILINGTELMOBILE"
    "TELMOBILE"
    "ORDER"
    "SID"
    "ENV"
    "IDCOL"
    "M"
    "E"
    "CDE"
    "I"
    "UG"
    "R"
    "RG"
    "CODE_ENVOI"
    "ID_UE_ENVOI"
    "ID_UT_ENVOI"
    "IDENVOI"
    "DMAJ"
    "ROW_ID"
    "STATUS_EMAIL"
    "STATUS_SMS"

An alert message will indicate, directly from Contactly, the fields to be renamed.