mx3.ucom.am has no CNAME records.
Question and response
Question
dig mx3.ucom.am. NS
Answer
The response has no answer records.
Authority
ucom.am. 5189 SOA ns.ucom.am. hostmaster.ucom.am. 2026022000 7200 3600 1209600 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0