buh1.ntppool.org has no MX records.
Question and response
Question
dig buh1.ntppool.org. MX
Answer
The response has no answer records.
Authority
ntppool.org. 300 SOA ns1.us.bitnames.com. dnsoper.bitnames.com. 2026021301 600 900 4838400 1200
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0