mailer-2.kmsvc.net has no MX records.
Question and response
Question
dig careerseducations.net. MX
Answer
The response has no answer records.
Authority
careerseducations.net. 1800 SOA carlos.ns.cloudflare.com. dns.cloudflare.com. 2398550404 10000 2400 604800 1800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0