ns4.ibrave.host has no MX records.
Question and response
Question
dig ns4.ibrave.host. MX
Answer
The response has no answer records.
Authority
ibrave.host. 86400 SOA dns1.namecheaphosting.com. cpanel.tech.namecheap.com. 1765354559 86400 7200 3600000 86400
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0