oos.webexchange.nu has no MX records.
Question and response
Question
dig oos.webexchange.nu. MX
Answer
The response has no answer records.
Authority
webexchange.nu. 300 SOA ns.wannafind.dk. hostmaster.wannafind.dk. 2026010602 14400 3600 1209600 300
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0