New Install Issue on Windows 2003 Server

Hello All, I am new to installing PHP on an Windows Box, but we needed to do this. I have the PHP pages working properly, but have a client that uses the mail() function and it is not working properly. I am getting the following error and can not figure out why. Can anyone help me out? Warning: mail() [function.mail <http://64.184.24.36/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 D:\inetpub\clients\v-pad.com\order_send.php on line 33 I have changed the SMTP to be our Imail server IP, but still keep getting this error message. Thanks, Grant Griffith EI8HTLEGS, A Division of ETC (812)932-1000