resources.indosat.com has no MX records.
Question and response
Question
dig resources.indosat.com. MX
Answer
The response has no answer records.
Authority
resources.indosat.com. 3600 SOA ns2.indosat.com. postmaster.no.email.please. 581095205 3600 600 2592000 3600
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0