Question and response
Question
dig smtp.ipasrv.us. NS
Answer
smtp.ipasrv.us. 5 CNAME mx1.ipasrv.us.
Authority
ipasrv.us. 3986 SOA dns.ipasrv.us. dns-admin.ipasrv.us. 2026010190 10800 3600 1209600 38400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0