spf.voipgateway.org has no CNAME records.
Question and response
Question
dig spf.voipgateway.org. NS
Answer
The response has no answer records.
Authority
voipgateway.org. 10800 SOA ns1.backbone.ch. hostmaster.backbone.ch. 2026030500 600 3600 604800 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0