ntp1.intra2net.com has no MX records.
Question and response
Question
dig ntp1.intra2net.com. MX
Answer
The response has no answer records.
Authority
intra2net.com. 300 SOA ns1.intra2net.com. postmaster.intra2net.com. 1761682893 10800 900 1209600 300
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0