"Email-based PHP-Script"

Hello List, I'm currently trying to setup a script which is processing incomming emails. So I setup PHP as CGI and did configurate the email like robot "|/path/to/the/script.php" The little testscript I tried looks like that: <? $fp = fopen("php://stdin","r"); while (!feof($fp)) { $BUFFER = fgets($fp); $INPUT .= $BUFFER; } mail ("info@receiver.de", "Test", "$INPUT", "From: test@sender.de"); fclose($fp); ?> The error which I get is /path/to/the/script.php: cannot open ?: no such file 554 5.3.0 unknown mailer error 2 Does anybody have some PHP code which would work to readout incomming emails or knows that's wrong with my little script? Thanks a lot. Juergen