寄不出EMAIL

小弟是用自己的電腦當SEVER(WINDOWS XP),當我要寄出EMAIL時出現下列錯誤訊息

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:\AppServ\www\drupal\includes\common.inc on line 1970.

PHP.ini內的相關設定如下

[mail function]
; For Win32 only.
SMTP = localhost
smtp_port = 25

; For Win32 only.
;sendmail_from = me@example.com

; For Unix only. You may supply arguments as well (default: "sendmail -t -i").
;sendmail_path =

; 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 =

請問,我應該做何修改或設定?
#我的DLINK25PORT有打開了