sns.nethost.sk has no MX records.
Question and response
Question
dig sns.nethost.sk. MX
Answer
The response has no answer records.
Authority
nethost.sk. 3600 SOA dns.nethost.cz. hostmaster.nethost.sk. 2026022000 10801 3600 3600000 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0