spf.relay.m247.global has no MX records.
Question and response
Question
dig spf.relay.m247.global. MX
Answer
The response has no answer records.
Authority
m247.global. 1800 SOA cheryl.ns.cloudflare.com. dns.cloudflare.com. 2396176220 10000 2400 604800 1800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0