a.ntpns.org has no MX records.
Question and response
Question
dig a.ntpns.org. MX
Answer
The response has no answer records.
Authority
ntpns.org. 3600 SOA ns1.us.bitnames.com. dnsoper.bitnames.com. 2026022200 600 900 3628800 3600
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0