Summary
mail2.gargox.com has one IP number.
ex.de,
fd0.net,
serq.net,
5991.net,
5991.com and at least 100 other hosts point to the same IP.
gargox.com use this as a mailserver.
gargox.com is delegated to two nameservers, however one delegated nameserver is missing in the zone and one other nameserver is listed instead. All of them are on different IP networks. Incoming mail for
gargox.com is handled by two mailservers at
gargox.com themselves. They are on different IP networks.
gargox.com has one IP number.