spf.cibex.net has no MX records.
Question and response
Question
dig spf.cibex.net. MX
Answer
The response has no answer records.
Authority
cibex.net. 3600 SOA dns2.telekom.at. domainadmin.a1.net. 2026012600 10800 3600 1814400 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0