Summary
mail.6x.to has one IP number , which is the same as for
6x.to.
h3.to,
6x.to,
c4.to,
ns.6x.to,
ehs.6x.to and at least 85 other hosts point to the same IP.
h3.to,
6x.to and
c4.to use this as a mailserver.
6x.to is a domain controlled by two nameservers at
6x.to themselves. They are on different IP networks. Incoming mail for
6x.to is handled by one mailserver also at
6x.to.
mail.6x.to is hosted on a server in Netherlands even though the hostname implies Tonga.