mx3.deac.lv has no CNAME records.
Question and response
Question
dig mx3.deac.lv. NS
Answer
The response has no answer records.
Authority
deac.lv. 3563 SOA ns1.deac.lv. hostmaster.deac.lv. 2026010702 10800 3600 604800 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0