smtp1.e-m.fr has one IP number , but the reverse is ns2.e-m.fr. ns2.e-m.fr and ns3.e-m.fr point to the same IP. e-m.fr, mdr.fr, iaart.com, wiiiz.com, tekyo.com and at least 100 other hosts use this as a mailserver. e-m.fr is a domain controlled by two nameservers having a total of three IP numbers. All of them are on the same IP network. Incoming mail for e-m.fr is handled by one mailserver at e-m.fr themselves. e-m.fr has one IP number. smtp1.e-m.fr is hosted on a server in France.