ns.vas-hosting.com has no MX records.
Question and response
Question
dig ns.vas-hosting.com. MX
Answer
The response has no answer records.
Authority
vas-hosting.com. 3600 SOA ns.vas-hosting.cz. info.vas-hosting.cz. 2512310822 28800 600 2419200 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0