smtp.halloma.com has no MX records.
Question and response
Question
dig smtp.halloma.com. MX
Answer
The response has no answer records.
Authority
halloma.com. 3600 SOA a.misconfigured.powerdns.server. hostmaster.halloma.com. 2023120102 10800 3600 604800 3600
Additional
. 0 OPT ; payload 1680, xrcode 0, version 0, flags 0