forward2.dds.nl has one IP number , but the reverse is smtp3.dds.nl. smtp3.dds.nl point to the same IP. cyu.nl, dkfs.nl, itft.net, puac.net, h-e-f.org and at least 100 other hosts use this as a mailserver. dds.nl is a domain controlled by two nameservers at dds.nl themselves. They are on the same IP network. Incoming mail for dds.nl is handled by five mailservers also at dds.nl. All of them are on the same IP network. dds.nl has one IP number. forward2.dds.nl is hosted on a server in Netherlands.