mail.managedns.ca has no NS records.
NS records for this zone are defined at managedns.ca.
NS records for this zone are defined at managedns.ca.
Question and response
Question
dig mail.managedns.ca. NS
Answer
The response has no answer records.
Authority
managedns.ca. 3600 SOA ns3.managedns.ca. noc.canhost.ca. 2014081108 3600 3600 604800 10800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0