spf.escaux.com has no MX records.
Question and response
Question
dig spf.escaux.com. MX
Answer
The response has no answer records.
Authority
escaux.com. 3600 SOA ns1.destiny.be. hostmaster.escaux.com. 2026022301 28800 7200 2419200 3600
Additional
. 0 OPT ; payload 1400, xrcode 0, version 0, flags 0