using mail () function.

[tavoqc]

Hey guys, thanks in advance for helping me with this...
I'm trying to use the mail() funciton but this warning appears:

Warning: mail() [function.mail]: Failed to connect to mailserver at "localhost" port 25, verify your "SMTP" and "smtp_port" setting in php.ini or use ini_set() in C:\Archivos de programa\xampp\htdocs\...

what do I have to do to configure it in order to work?