Problem with loadvars

so, my swf sends emails via php interaction. i run it from my computer using the flash player - it works fine. i run it from my computer using a browser (tested in ie and firefox) - it works fine.

i put it on a webserver and use it there, everything works except for the email. the data is sent from the swf to the php file via the loadvars function.

any ideas why it does this or how to fix it?