sending emails programmatically from php

[#1]

I bet you can't crack this one!
I'm running some PHP software (oscommerce) under xampp
in a mac osx (panther) environment. The software purports to
send email confirmation of orders but these never arrive.
I've modified php.ini as reccommended and set up a mail server for
smtp but still no joy.
Can't help me can you? 
Wimps!

[#2]

The only PHP email shizzle I've played about with is below :

<?php
$to = "mywife47837983@hotmail.com";
$message = "Are you ready for bed yet ?";
mail($to, "Bedtime ?", $message,"From: dom@emaildomain.co.uk", "-fdom@emaildomain.co.uk");
?>

Have you checked any of your logfiles to see if it's flagged up why your message isn't being sent ?