gateway1.energa.pl has no MX records.
Question and response
Question
dig gateway1.energa.pl. MX
Answer
The response has no answer records.
Authority
energa.pl. 86400 SOA ns1.ps.oktawave.com. hostmaster.k2.pl. 2026011503 14400 3600 604800 86400
Additional
. 0 OPT ; payload 1680, xrcode 0, version 0, flags 0