client-backup-2.sk.eserver.net has no MX records.
Question and response
Question
dig client-backup-2.sk.eserver.net. MX
Answer
The response has no answer records.
Authority
sk.eserver.net. 1800 SOA ns1.eserver.net. hostmaster.eserver.sk. 2025102801 7200 3600 604800 1800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0