ns1.delta-telecom.net has no MX records.
Question and response
Question
dig ns1.delta-telecom.net. MX
Answer
The response has no answer records.
Authority
delta-telecom.net. 86400 SOA ns1.azersat.com. webmaster.delta-telecom.net. 2026030105 43200 7200 2419200 86400
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0