Question and response
Question
dig mx3.semcabo.pt. NS
Answer
mx3.semcabo.pt. 5 CNAME lastmx.spamexperts.net.
Authority
spamexperts.net. 57 SOA ns-384.awsdns-48.com. awsdns-hostmaster.amazon.com. 1 7200 900 1209600 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0