barracuda.ucn.net has no MX records.
Question and response
Question
dig barracuda.ucn.net. MX
Answer
The response has no answer records.
Authority
ucn.net. 3600 SOA via-mx1.ucn.net. admin.ucn.net. 774745 900 3600 3600 3600
Additional
. 0 OPT ; payload 1224, xrcode 0, version 0, flags 0