sm001oh.metricstream.com has no MX records.
Question and response
Question
dig sm001oh.metricstream.com. MX
Answer
The response has no answer records.
Authority
metricstream.com. 1800 SOA elle.ns.cloudflare.com. dns.cloudflare.com. 2397879073 10000 2400 604800 1800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0