mail.ktmtelekom.pl has no MX records.
Question and response
Question
dig mail.ktmtelekom.pl. MX
Answer
The response has no answer records.
Authority
ktmtelekom.pl. 3600 SOA ns1.ktmtelekom.pl. hostmaster.ktmtelekom.pl. 2026021203 3600 3600 1209600 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0