cold.hipaasource.com has no MX records.
Question and response
Question
dig cold.hipaasource.com. MX
Answer
The response has no answer records.
Authority
hipaasource.com. 10800 SOA ns1.tirfecta.com. postmaster.tirfecta.com. 2025061812 28800 7200 1209600 10800
Additional
. 0 OPT ; payload 2800, xrcode 0, version 0, flags 0