cust.bredband2.com has no MX records.
Question and response
Question
dig cust.bredband2.com. MX
Answer
The response has no answer records.
Authority
cust.bredband2.com. 600 SOA pdns01.port53.se. postmaster.port53.se. 2028184120 7200 1800 1209600 600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0