mail.elementdesign.cz has no MX records.
Question and response
Question
dig mail.elementdesign.cz. MX
Answer
The response has no answer records.
Authority
elementdesign.cz. 3600 SOA ns1.tele3.cz. root.tele3.cz. 1770419834 28800 7200 1209600 43200
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0