tls-spf.ubivox.com has no MX records.
Question and response
Question
dig tls-spf.ubivox.com. MX
Answer
The response has no answer records.
Authority
ubivox.com. 300 SOA ns1.curanet.dk. hostmaster.curanet.dk. 2026022301 14400 3600 1209600 300
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0