_spf.mail03-userengage.com has no MX records.
Question and response
Question
dig _spf.mail03-userengage.com. MX
Answer
The response has no answer records.
Authority
mail03-userengage.com. 600 SOA ns1.mail03-userengage.com. root.mail03-userengage.com. 2025072402 28800 7200 604800 3600
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0