SPF in DNS's and mail servers

[Alejandro <alejandritox@ciudad.com.ar>]

Dear all, I need to know if the SPF protocol used in DNS's and mail 
servers  to avoid spam is used  by a lot af administrators or it's just 
a new protocol without future in Internet.

I'll go to edit my zone files in the DNS's with the SPF fields in order 
to let other mail servers check them to know if sender domains are valid 
or  invalid (spammers).

Thanks a lot,

alejandro