bgc.spf.secure-mail.be has no CNAME records.
Question and response
Question
dig bgc.spf.secure-mail.be. NS
Answer
The response has no answer records.
Authority
spf.secure-mail.be. 3600 SOA ns1.skynet.be. dnsmaster.skynet.be. 83 10800 3600 3600000 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0