sputnik.ugbb.net has no MX records.
Question and response
Question
dig sputnik.ugbb.net. MX
Answer
The response has no answer records.
Authority
ugbb.net. 1800 SOA ns1.telemach.net. hostmaster.telemach.net. 2020112484 28800 7200 604800 86400
Additional
. 0 OPT ; payload 768, xrcode 0, version 0, flags 0