vcmail.viewcentral.com has no CNAME records.
Question and response
Question
dig vcmail.viewcentral.com. NS
Answer
The response has no answer records.
Authority
viewcentral.com. 298 SOA ns1-37.azure-dns.com. azuredns-hostmaster.microsoft.com. 2016101631 3600 300 1844400 300
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0