spring-uh-0-panama.uhserver.com has no MX records.
Question and response
Question
dig spring-uh-0-panama.uhserver.com. MX
Answer
The response has no answer records.
Authority
uhserver.com. 300 SOA ns1.host.uol.com.br. admin.uolhost.com.br. 2025093001 43200 3600 604800 300
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0