smtp01.fibianet.dk has no MX records.
Question and response
Question
dig smtp01.fibianet.dk. MX
Answer
The response has no answer records.
Authority
fibianet.dk. 900 SOA ns1.fibianet.dk. hostmaster.fibia.dk. 2026022635 21600 3600 1209600 900
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0