cas01.pin.se has no MX records.
Question and response
Question
dig cas01.global.pin.se. MX
Answer
The response has no answer records.
Authority
global.pin.se. 3600 SOA dc03.global.pin.se. hostmaster.global.pin.se. 2017294613 30 60 86400 3600
Additional
. 0 OPT ; payload 4000, xrcode 0, version 0, flags 0