185-252-90-21.ipv4.tkcsystem.cz has no MX records.
Question and response
Question
dig 185-252-90-21.ipv4.tkcsystem.cz. MX
Answer
The response has no answer records.
Authority
tkcsystem.cz. 3600 SOA ns.forpsi.net. admin.forpsi.com. 2026030401 14400 3600 2592000 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0