mx.valex.cloud has no NS records.
NS records for this zone are defined at valex.cloud.
NS records for this zone are defined at valex.cloud.
Question and response
Question
dig mx.valex.cloud. NS
Answer
The response has no answer records.
Authority
valex.cloud. 1800 SOA ricardo.ns.cloudflare.com. dns.cloudflare.com. 2396909994 10000 2400 604800 1800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0