spf.mailspot.info has no MX records.
Question and response
Question
dig spf.mailspot.info. MX
Answer
The response has no answer records.
Authority
mailspot.info. 3600 SOA ns1.101domain.com. ADMIN.mailspot.info. 2020070920 10800 3600 604800 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0