That tutorial worked fine for me. Did you change any code? Try uploading the tutorial swf to your server along with the modified email.php and sending yourself an email from it. If it doesnt work from there php support is most likely the problem.
I did have a problem when I added some code to the “send” button. Moved it elsewhere and it worked fine again.
Does anyone know how to keep it from sending blank emails if someone hits the send button without putting any content in?