Question and response
Question
dig singdns.dnsracks.com. MX
Answer
singdns.dnsracks.com. 14400 MX 0 singdns.dnsracks.com.
Authority
The response has no authority records.
Additional
singdns.dnsracks.com. 14400 A 128.199.140.115
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0