regulus.bluetone.cz has no MX records.
Question and response
Question
dig regulus.bluetone.cz. MX
Answer
The response has no answer records.
Authority
bluetone.cz. 3600 SOA ns.bluetone.cz. root.bluetone.cz. 2026020200 3600 3600 1209600 10800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0