spf.nodeping.com has no MX records.
Question and response
Question
dig spf.nodeping.com. MX
Answer
The response has no answer records.
Authority
nodeping.com. 300 SOA ns1.nodeping.com. info.nodeping.com. 2026022102 43200 3600 1209600 300
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0