mta0.wealhbt.com has no MX records.
Question and response
Question
dig mta0.wealhbt.com. MX
Answer
The response has no answer records.
Authority
wealhbt.com. 1800 SOA hattie.ns.cloudflare.com. dns.cloudflare.com. 2395315081 10000 2400 604800 1800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0