webmail.amtex.com.co has no CNAME records.
Question and response
Question
dig webmail.amtex.com.co. NS
Answer
The response has no answer records.
Authority
amtex.com.co. 157 SOA ns29.domaincontrol.com. dns.jomax.net. 2023050500 28800 7200 604800 600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0