iis101.windows.loopia.com has no MX records.
Question and response
Question
dig iis101.windows.loopia.com. MX
Answer
The response has no answer records.
Authority
windows.loopia.com. 3600 SOA alfa.ns.active24.cz. hostmaster.active24.cz. 2018111302 10800 1800 1209600 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0