making sure sendmail function is on and running

Background: Server-Apache 1.3.31 OS-Windows XP PHP-5 Problem-I'm trying to run eFiction, a story/fanfiction archive script. On this, people self register, and they are supposed to get an e-mail with their password. However, I and one other attempted signing up, and neither of us got our password-email. After doing research, I heard I needed to make sure that my sendmail function was activated. How do I make sure that my sendmail function is on and running? I read the documentation and checked my php.ini, but I have some doubts. 1. My php.ini doesn't seem to include everything that should be either. In the documentation, it shows your mail section having four parts: SMTP, SMTP Port, sendmail_from, sendmail_path. However, php.ini looks like this (windows section): [mail function] ; For Win32 only. SMTP = localhost smtp_port = 25 ; For Win32 only. ;sendmail_from = me@example.com There is a sendmail_path down below, but it is under the For Linux Only section. What's with that? Also, I have a router. Do I need to port-forward port 25 to get sendmail to work? Thanks in advance. -Andrew