mx1.olszewscy.net has no MX records.
Question and response
Question
dig mx1.olszewscy.net. MX
Answer
The response has no answer records.
Authority
olszewscy.net. 300 SOA ns.olszewscy.net. hostmaster.olszewscy.net. 2026021813 7200 3600 2419200 10800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0