mail-in03.adhost.com has no MX records.
Question and response
Question
dig mail-in03.adhost.com. MX
Answer
The response has no answer records.
Authority
adhost.com. 86400 SOA ns1.ral.hostedsolutions.com. hostmaster.hostedsolutions.com. 2018091372 10800 3600 604800 86400
Additional
. 0 OPT ; payload 1220, xrcode 0, version 0, flags 0