mail81.ipnordic.dk has no MX records.
Question and response
Question
dig mail81.ipnordic.dk. MX
Answer
The response has no answer records.
Authority
ipnordic.dk. 3600 SOA ns81.ipnordic.dk. sysops.ipnordic.dk. 1773045099 28800 7200 604800 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0