mail.firoptix.co.id has no MX records.
Question and response
Question
dig mail.firoptix.co.id. MX
Answer
The response has no answer records.
Authority
firoptix.co.id. 300 SOA dns1.firoptix.co.id. hostmaster.firoptix.co.id. 2017033024 43200 7200 1209600 300
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0