ns4.creoline.net has no MX records.
Question and response
Question
dig ns4.creoline.net. MX
Answer
The response has no answer records.
Authority
creoline.net. 3600 SOA ns1.creoline.net. noc.creoline.com. 2026021802 7200 1800 1209600 3600
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0