_spf.planet-work.com has no CNAME records.
Question and response
Question
dig _spf.planet-work.com. NS
Answer
The response has no answer records.
Authority
planet-work.com. 1699 SOA ns1.planet-work.com. tech.planet-work.com. 2025060301 28800 7200 2419200 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0