go
xvn.jp use this as a mailserver. xvn.jp is a domain controlled by two nameservers at domaincontrol.com. They are on different IP networks. Incoming mail for xvn.jp is handled by one mailserver at xvn.jp themselves.

xvn.jp
ns-soa records
ns11.domaincontrol.com
+ 216.69.185.6 216.69.185.0/24 AS26496 -
+ --- -
ns records
ns11.domaincontrol.com
+ 216.69.185.6 216.69.185.0/24 AS26496 -
+ --- -
ns12.domaincontrol.com
+ 208.109.255.6 208.109.255.0/24 AS26496 -
mx records
mx.xvn.jp
+   AS?  
+ ---  
domains using this as mailserver
xvn.jp