Incoming mail for estumail.ucm.es is handled by one mailserver at ucm.es. estumail.ucm.es has one IP number , which also has a corresponding reverse pointer. ucm.es, red.ucm.es, pdi.ucm.es, pas.ucm.es, sis.ucm.es and at least 100 other hosts share mailservers with this domain. ucm.es is a domain controlled by four nameservers. Some of them are on the same IP network. Incoming mail for ucm.es is handled by one mailserver also at ucm.es. estumail.ucm.es is hosted on a server in Spain.