auth02.ns.td-fn.net has no MX records.
Question and response
Question
dig auth02.ns.td-fn.net. MX
Answer
The response has no answer records.
Authority
ns.td-fn.net. 3600 SOA auth02.ns.td-fn.net. hostmaster.td-fn.net. 2025040804 7200 7200 1209600 86400
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0