Instance of: http://www.w3.org/2004/02/skos/core#Concept
Subject Field Subject Field/3226003
Is Reference of Electronic mail gateway service-en#Sense
Servicio cabeza de linea de correo electrónico-es#Sense
Serviço de vanguarda de mensagens eletrónicas-pt#Sense
Service tête de ligne de messagerie électronique-fr#Sense