spf1.groupeot.com has no MX records.
Question and response
Question
dig spf1.groupeot.com. MX
Answer
The response has no answer records.
Authority
groupeot.com. 3600 SOA ns1.celhost.eu. hostmaster.groupeot.com. 1772078615 10800 3600 604800 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0