mail.computerpoint.net has no CNAME records.
Question and response
Question
dig mail.computerpoint.net. NS
Answer
The response has no answer records.
Authority
computerpoint.net. 2243 SOA dns01.cpinet. hostmaster.computerpoint.net. 2026010606 3600 600 1209600 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0