zimbra.maxbb.net has no CNAME records.
Question and response
Question
dig zimbra.maxbb.net. NS
Answer
The response has no answer records.
Authority
maxbb.net. 220 SOA ns11.domaincontrol.com. dns.jomax.net. 2025101501 28800 7200 604800 600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0