branch.rocks has no MX records.
Question and response
Question
dig branch.rocks. MX
Answer
The response has no answer records.
Authority
branch.rocks. 1800 SOA brianna.ns.cloudflare.com. dns.cloudflare.com. 2396361407 10000 2400 604800 1800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0