Question and response
Question
dig mrelay.perfora.net. NS
Answer
mrelay.perfora.net. 5 CNAME smtp.perfora.net.
Authority
perfora.net. 600 SOA rns.ui-dns.de. dnsadmin.1und1.de. 2013099627 10800 3600 604800 600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0