smtp.myfibermail.com has no MX records.
Question and response
Question
dig smtp.myfibermail.com. MX
Answer
The response has no answer records.
Authority
myfibermail.com. 7200 SOA ns1.epbinternet.com. noc.epbinternet.com. 2023050405 10802 3600 604800 38400
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0