zabbix.jtibs.net has no MX records.
Question and response
Question
dig zabbix.jtibs.net. MX
Answer
The response has no answer records.
Authority
jtibs.net. 60 SOA ns0.jtibs.net. hostmaster.jtibs.net. 2025060402 43200 7200 1209600 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0