cvcauth.com has no MX records.
Question and response
Question
dig cvcauth.com. MX
Answer
The response has no answer records.
Authority
cvcauth.com. 900 SOA authns1.cv.net. postmaster.cv.net. 2015165985 7200 600 604800 900
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0