sequoia.kcir.pwr.edu.pl has no MX records.
Question and response
Question
dig sequoia.kcir.pwr.edu.pl. MX
Answer
The response has no answer records.
Authority
kcir.pwr.edu.pl. 3600 SOA amargosa.kcir.pwr.edu.pl. witold.kcir.pwr.edu.pl. 2026011900 86400 7200 1209600 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0