SPF record don't work

[SantiagoA]

Hi!!

I'm trying to create an outgoing SPF record.

I add this entry on the DNS templates:

mydomain.com. TXT v=spf1 +a +mx +ip4:XXX.XXX.XXX.XXX -all

(I have the nameserver pointed to my IP/server)

To check is SPF record work correctly, i send an email to: check-auth@verifier.port25.com

This tool, send me to me the result:

==========================================================
Summary of Results
==========================================================
SPF check: fail
DomainKeys check: pass
DKIM check: neutral
Sender-ID check: fail
SpamAssassin check: ham

----------------------------------------------------------
SPF check details:
----------------------------------------------------------
Result: fail (not permitted)
ID(s) verified: smtp.mailfrom=mail@mydomain.com
DNS record(s):
mydomain.com. SPF (no records)
mydomain.com. 86400 IN TXT "v=spf1 +a +mx +ip4:217.160.6.80 -all"
mydomain.com. AAAA (no records)
mydomain.com. 86400 IN MX 10 mail.mixfotos.com.
mail.mydomain.com. AAAA (no records)

Is like the TXT record with the SPF are not read or valid...

Can You help me please!

Thanksss!!!