authns1.cvnet.com has no MX records.
Question and response
Question
dig authns1.cvnet.com. MX
Answer
The response has no answer records.
Authority
cvnet.com. 900 SOA authns1.cv.net. abuse.cv.net. 2013126337 7200 600 604800 900
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0