leo.stresovice.net has no MX records.
Question and response
Question
dig mail.mithrandir.cz. MX
Answer
The response has no answer records.
Authority
mithrandir.cz. 3600 SOA ns.spoje.net. tech.spoje.net. 1772647217 3600 600 1209600 3600
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0