ns3.safedc.net has no MX records.
Question and response
Question
dig ns3.safedc.net. MX
Answer
The response has no answer records.
Authority
safedc.net. 600 SOA ns0.safedc.net. hostmaster.safespring.com. 1772536202 7200 3600 864000 600
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0