ns2.dnsvisa.com has no MX records.
Question and response
Question
dig ns2.dnsvisa.com. MX
Answer
The response has no answer records.
Authority
dnsvisa.com. 1800 SOA ns1.dnsvisa.com. dns.cloudflare.com. 2361873767 10000 2400 604800 1800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0