ait-psmtp05.win.dtu.dk has no MX records.
Question and response
Question
dig ait-psmtp05.win.dtu.dk. MX
Answer
The response has no answer records.
Authority
win.dtu.dk. 900 SOA dns3.dtu.dk. dnsadmin.dtu.dk. 1307871770 3600 900 604800 900
Additional
. 0 OPT ; payload 1220, xrcode 0, version 0, flags 0