spf.mydomainprovider.com has no MX records.
Question and response
Question
dig spf.mydomainprovider.com. MX
Answer
The response has no answer records.
Authority
mydomainprovider.com. 3600 SOA ns1.premiumdns.zone. hostmaster.mydomainprovider.com. 2026015633 10800 3600 604800 3600
Additional
. 0 OPT ; payload 1400, xrcode 0, version 0, flags 0