partner_c_spf.monster.com has no CNAME records.
Question and response
Question
dig partner_c_spf.monster.com. NS
Answer
The response has no answer records.
Authority
monster.com. 600 SOA ns1.tmpw.net. hostmaster.tmpw.net. 1772026685 1800 600 604800 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0