PHP programming forum. Ask questions or help people concerning PHP code. Don't understand a function? Need help implementing a class? Don't understand a class? Here is where to ask. Remember to do your homework!
When I compose a message in Outlook Express and attach files - it's ok, I tried to reproduce all the headers/boundaries - but still got attached files displayed in the message body.
I'd recommend getting one of the many classes that deal with the details of creating and sending email. I can recommend PHPMailer and PEAR has a Mail class as well.