dendrite.com has no MX records.
Question and response
Question
dig dendrite.com. MX
Answer
The response has no answer records.
Authority
dendrite.com. 1200 SOA dnsus.imshealth.com. plydnsds.us.imshealth.com. 2016010402 86400 7200 1814400 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0