mx.valex.cloud has no CNAME records.
Question and response
Question
dig mx.valex.cloud. NS
Answer
The response has no answer records.
Authority
valex.cloud. 803 SOA ricardo.ns.cloudflare.com. dns.cloudflare.com. 2396909994 10000 2400 604800 1800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0