spf.boldem.cz has no MX records.
Question and response
Question
dig spf.boldem.cz. MX
Answer
The response has no answer records.
Authority
boldem.cz. 3600 SOA ns1.ignum.eu. root.ignum.eu. 2026022101 28800 7200 604800 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0