mail.regiofiber.cz has no MX records.
Question and response
Question
dig mail.regiofiber.cz. MX
Answer
The response has no answer records.
Authority
regiofiber.cz. 3600 SOA ans.nsys.cz. admin.nsys.cz. 2024090501 14400 3600 1209600 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0