php - Mail() won't send in windows server2003 -

I installed PHP in Windows Server 2003. All files are working fine except for mail problems. There is no problem in SMTP because I run the JSP project in the same server. Work fine in that mail function. So where is the problem? And how do I manage? I have set the SMTP server

  in PHP; Only SMTP for Win32 = localhost smtp_port = 25  

Does the SMTP service require authentication? is? Perhaps there is a setting in the JSP code which authenticates against SMTP server? You can see the JSP code to see a different SMTP configuration.

Another reason may be that SMTP only allows specific sender addresses / domains. Are the sender addresses of PHP and JSP applications different?