Question and response
Question
dig sse.cisco.com. MX
Answer
sse.cisco.com. 3600 MX 10 inbound-smtp.us-west-2.amazonaws.com.
Authority
sse.cisco.com. 3600 NS auth1.opendns.com.
sse.cisco.com. 3600 NS auth2.opendns.com.
Additional
. 32768 OPT ; payload 4000, xrcode 0, version 0, flags 32768
auth1.opendns.com. 172800 AAAA 2620:119:30:0:0:0:0:53
auth1.opendns.com. 172800 A 208.69.39.2
auth2.opendns.com. 172800 AAAA 2a04:e4c0:53:0:0:0:0:53
auth2.opendns.com. 172800 A 146.112.60.53