mx0.f.htel.cc has no CNAME records.
Question and response
Question
dig mx0.f.htel.cc. NS
Answer
The response has no answer records.
Authority
f.htel.cc. 3351 SOA ns.noc.mol.net.ua. hostmaster.mol.net.ua. 2025112700 3600 900 86400 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0