g.ntpns.org has no MX records.
Question and response
Question
dig g.ntpns.org. MX
Answer
The response has no answer records.
Authority
g.ntpns.org. 3600 SOA a.ntpns.org. hostmaster.g.ntpns.org. 1733290427 5400 5400 1209600 3600
Additional
. 0 OPT ; payload 1280, xrcode 0, version 0, flags 0