_spf.webnx.com has no CNAME records.
Question and response
Question
dig _spf.webnx.com. NS
Answer
The response has no answer records.
Authority
webnx.com. 3239 SOA ns1.webnx.com. webmaster.webnx.com. 2026022501 1800 7200 1209600 6400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0