Iwan Luijks has a recent post looking at how you can send email through PHP on Windows via the Apache James server.

eveloping in PHP on Windows? Yep me too! Unfortunatly in opposite to developing on Linux, sending e-mail from PHP on Windows requires some more setup than just a bit of sendmail configuration. In this post I explain how to setup an Apache James Server and use it for e-mailing from PHP, all from and to your localhost.

He walks you through the download and installation and includes the changes you'll need to make to get it up and running correctly. He helps you test it's working correctly and how to get PHP set up and pointing to it for mail delivery. Finally, he has a line of PHP (using mail) to test the install and send a sample message.