Question and response
Question
dig lfhk.cuni.cz. MX
Answer
lfhk.cuni.cz. 1800 MX 20 lfhk-cuni-cz.mail.protection.outlook.com.
Authority
The response has no authority records.
Additional
. 0 OPT [{Extended_DNS_Error: PROHIBITED}] ; payload 1232, xrcode 0, version 0, flags 0