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Sorry, we have no information about ppv.xvn.jp. 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?  
+ ---