I want to know if it is possible to ad a spf record to a subdomain that already had a CNAME record?
Example for my case :
My dns zone:
####################################
; Modified by Web Host Manager
; Zone File for ibiza-voice.com
$TTL 14400
@ 14440 IN SOA ns-677-1.burtondns.net. ################ (
########
14400
7200
3600000
86400
)

ibiza-voice.com. 14400 IN NS ns-677-1.burtondns.net.
ibiza-voice.com. 14400 IN NS ns-677-2.burtondns.net.

ibiza-voice.com. 14400 IN A 63.247.93.98

localhost.ibiza-voice.com. 14400 IN A 127.0.0.1

ibiza-voice.com. 14400 IN MX 0 ibiza-voice.com.

mail 14400 IN CNAME ibiza-voice.com.
www 14400 IN CNAME ibiza-voice.com.
ftp 14400 IN A 63.247.93.98
newsletter 14400 IN CNAME ibiza.lyris.net.
www.newsletter 14400 IN CNAME ibiza.lyris.net.
ibiza-voice.com. 14400 IN TXT "v=spf1 a mx ?all"
######################################################

How a spf records line like newsletter.ibiza-voice.com.IN TXT "v=spf1 a mx ?all"
can work in a DNS zone?
Or is not possible?