no-mx.telerova.de is delegated to one nameserver, however one delegated nameserver is missing in the zone. All nameservers are at site-ha.de. gugl.eu, pamela.in, pornos.de, iuc-lmu.de, fixx-it.de and at least 100 other hosts use this as a mailserver. telerova.de is a domain controlled by two nameservers at trv.de. They are on different IP networks. Incoming mail for telerova.de is handled by two mailservers at ispmail.de. They are on different IP networks. telerova.de has one IP number.