smtp2.csag.uct.ac.za has no CNAME records.
Question and response
Question
dig smtp2.csag.uct.ac.za. NS
Answer
The response has no answer records.
Authority
uct.ac.za. 49805 SOA ucthpx.uct.ac.za. hostmaster.uct.ac.za. 2100467268 3600 1800 604800 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0