mail.vtecrm.com has no CNAME records.
Question and response
Question
dig mail.vtecrm.com. NS
Answer
The response has no answer records.
Authority
vtecrm.com. 211 SOA dns.technorail.com. hostmaster.vtecrm.com. 2024091601 86400 7200 2592000 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0