Question and response
Question
dig yamahoo.com. MX
Answer
yamahoo.com. 3600 MX 0 mx.yamahoo.com.
Authority
The response has no authority records.
Additional
mx.yamahoo.com. 3600 A 216.245.192.99
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0