mo2.osimail2.us has no MX records.
Question and response
Question
dig mo2.osimail2.us. MX
Answer
The response has no answer records.
Authority
osimail2.us. 600 SOA ns13.domaincontrol.com. dns.jomax.net. 2022101803 28800 7200 604800 600
Additional
. 0 OPT ; payload 1280, xrcode 0, version 0, flags 0