ns2.clickable.systems has no MX records.
Question and response
Question
dig ns2.clickable.systems. MX
Answer
The response has no answer records.
Authority
clickable.systems. 600 SOA ns1.clickable.systems. gido.clickable.systems. 1772600401 604800 86400 2419200 604800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0