spf.de.umantis.com has no MX records.
Question and response
Question
dig spf.de.umantis.com. MX
Answer
The response has no answer records.
Authority
de.umantis.com. 3600 SOA ns1.umantis.com. hostmaster.umantis.com. 2026021901 7200 1800 1209600 3600
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0