email application help. Send email to made up email address which is redirected to real email

You're basically describing a http://en.wikipedia.org/wiki/Mail%5Ftransfer%5Fagent AKA mail server. So all you need to do is a server to run it on, the required MX DNS records, and an API that allows you to configure forward addresses. Look through the documentation of the servers http://en.wikipedia.org/wiki/Comparison%5Fof%5Fmail%5Fservers to see which ones offer the latter.

Just pipe all orphan email (specific to that domain) to ur PHP script and use something like this to extract the email content: $fd = fopen("php://stdin", "r"); $email = ""; while (!feof($fd)) { $email .= fread($fd, 1024); } fclose($fd); then extract the "to" field and if it belongs to a user .. forward the email to him.If you have cPanel .. this is even easier. goto mail > default address > set default address and instead of putting an email address there put something like this "|php -q /home/whatever/public_html/pipe.php" .. ofcourse without the quotes