barracuda.southdata.com has no MX records.
Question and response
Question
dig barracuda.southdata.com. MX
Answer
The response has no answer records.
Authority
southdata.com. 1800 SOA dns1.p01.nsone.net. hostmaster.nsone.net. 134 3600 600 604800 1800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0