Question and response
Question
dig mx1.ip-exchange.de. NS
Answer
mx1.ip-exchange.de. 5 CNAME mx.ext-dc.de.
Authority
ext-dc.de. 300 SOA ns.ext-dc.net. hostmaster.ext-dc.de. 2025120503 10800 3600 604800 300
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0