qmail.3rex.net has one IP number , which also has a corresponding reverse pointer. mail.yws.se, mail.omc.se, mail.hem.nu, mail.ega.nu, mail.daj.nu and at least 69 other hosts point to the same IP. 3rex.net is a domain controlled by four nameservers at 3rex.net themselves. Two of them are on the same IP network. Incoming mail for 3rex.net is handled by two mailservers also at 3rex.net. They are on the same IP network. qmail.3rex.net is hosted on a server in Sweden.