_spf-msgfocus.plus.net has no CNAME records.
Question and response
Question
dig _spf-msgfocus.plus.net. NS
Answer
The response has no answer records.
Authority
plus.net. 876 SOA ns1.force9.net. hostmaster.plus.net.uk. 2026021301 43200 1800 3600000 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0