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Sorry, we have no information about vm-cust.virtualnix.com. virtualnix.com is a domain controlled by two nameservers at virtualnix.com themselves. They are on different IP networks. Incoming mail for virtualnix.com is handled by two mailservers having a total of three IP numbers. There are three duplicated IP numbers. Some of them are on the same IP network.

virtualnix.com
ns-soa records
ns1.virtualnix.com
+ 208.116.32.51 208.116.0.0/18 AS25653  
+ ---  
ns records
ns1.virtualnix.com
+ 208.116.32.51 208.116.0.0/18 AS25653  
+ ---  
ns2.virtualnix.com
+ 68.64.137.36 68.64.136.0/23 AS7830  
mx records
mx-backup.mxbarrier.com
+ 71.83.140.230 71.83.128.0/19 AS20115  
+ ---  
+ 199.36.31.131 199.36.28.0/22 AS40633  
+ 199.36.31.132 199.36.28.0/22 AS40633  
mx-primary.mxbarrier.com
+ 71.83.140.230 71.83.128.0/19 AS20115  
+ 199.36.31.131 199.36.28.0/22 AS40633  
+ 199.36.31.132 199.36.28.0/22 AS40633  
ip numbers using ptr to this host
67.207.190.48