cesky-hosting.eu has no MX records.
Question and response
Question
dig cesky-hosting.eu. MX
Answer
The response has no answer records.
Authority
cesky-hosting.eu. 1800 SOA ns1.thinline.cz. hostmaster.cesky-hosting.eu. 1533053848 86400 300 604800 1800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0