mail2.castleandco.com has three IP numbers. Two of them are on the same IP network. This hostname cnames to cluster1a.eu.messagelabs.com. mail2.wdmn.nl, mail4.iata.org, mail.vedior.nl, mx2.startv.com, mx2.s-r-a.co.uk and at least 56 other hosts point to the same IP. castleandco.com use this as a mailserver. castleandco.com is delegated to two nameservers, however both delegated nameservers are missing in the zone and two other nameservers are listed instead. There are two duplicated IP numbers. Some of them are on the same IP network. Incoming mail for castleandco.com is handled by two mailservers having a total of six IP numbers. Two of them are on the same IP network.