Problem in sending email from localhost

Hi,

  I am trying to send mail from my localhost but i am getting the below
error
""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 F:\test\xampp\htdocs\sendmail.php on line 42'"

I am using xampp server. Can anyone please tell me what is the error

My "php.ini" code is
[mail function]
; For Win32 only.
; http://php.net/smtp
SMTP = smtp.gmail.com
; http://php.net/smtp-port
smtp_port = 587

; For Win32 only.
; http://php.net/sendmail-from
;sendmail_from = [email protected]

; For Unix only.  You may supply arguments as well (default:
"sendmail -t -i").
; http://php.net/sendmail-path
;sendmail_path = "\"F:\test\xampp\sendmail\sendmail.exe\" -t"

; Force the addition of the specified parameters to be passed as
extra parameters
; to the sendmail binary. These parameters will always replace the value of
; the 5th parameter to mail(), even in safe mode.
;mail.force_extra_parameters =

; Add X-PHP-Originating-Script: that will include
uid of the script followed by the filename
mail.add_x_header = Off

; Log all mail() calls including the full path of the script, line
#, to address and headers
;mail.log = "F:\test\xampp\apache\logs\php_mail.log"