mail.rhscz.eu has no MX records.
Question and response
Question
dig mail.rhscz.eu. MX
Answer
The response has no answer records.
Authority
rhscz.eu. 3600 SOA ns1.rhscz.eu. hostmaster.rhscz.eu. 1772279588 3600 1800 1814400 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0