frontmta.hostedsepo.dk has no MX records.
Question and response
Question
dig frontmta.hostedsepo.dk. MX
Answer
The response has no answer records.
Authority
hostedsepo.dk. 600 SOA ns01.one.com. hostmaster.one.com. 2026010212 14400 3600 1209600 600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0