spf.portal.nitronet.pl has no MX records.
Question and response
Question
dig spf.portal.nitronet.pl. MX
Answer
The response has no answer records.
Authority
portal.nitronet.pl. 3600 SOA dns.nitronet.pl. hostmaster.portal.nitronet.pl. 2025090501 10800 3600 604800 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0