mail.fornex.org has no CNAME records.
Question and response
Question
dig mail.fornex.org. NS
Answer
The response has no answer records.
Authority
fornex.org. 300 SOA ns1.fornex.com. hostmaster.fornex.com. 2772554640 46800 1800 3600000 300
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0