ip-45.197.gst.net.id has no MX records.
Question and response
Question
dig ip-45.197.gst.net.id. MX
Answer
The response has no answer records.
Authority
gst.net.id. 86400 SOA ns1.gst.net.id. postmaster.gst.net.id. 2026020533 3600 7200 1209600 86400
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0