ms.amigodospets.com has no MX records.
Question and response
Question
dig ms.amigodospets.com. MX
Answer
The response has no answer records.
Authority
amigodospets.com. 1800 SOA clint.ns.cloudflare.com. dns.cloudflare.com. 2395791555 10000 2400 604800 1800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0