How to send email using PHP

Hello friends
I have install php on my home pc and configure IIS server and default SMTP server.
I am developing customer feedback site in php.
Can I send email using defaul SMTP server in XP or I have to download other smtp server.
I have make program which sends email successfully but i cannot recive from my email address as receiver.
I have downloaded on SMTP server but when i send email, I can recive email to SMTP server not on my yahoo or hotmail account.
So i need to know how to config SMTP server.
Thanks