smtp7.livemailservice.com has no MX records.
Question and response
Question
dig smtp7.livemailservice.com. MX
Answer
The response has no answer records.
Authority
livemailservice.com. 1800 SOA andy.ns.cloudflare.com. dns.cloudflare.com. 2395767195 10000 2400 604800 1800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0