I want to send incoming emails to a PHP script for processing. I could write a PHP script that checks an IMAP account and set up a cron job, but I’d rather instantly pipe incoming emails to a script to so I don’t have to hammer the mail server.
In the Panel I’ve gone to Mail > Message Filters and set up forwarding to a shell account. (see , ) Where does the email end up? Is it stored in some spool file you have to check periodically or could I just create a .forward.postfix? (see )
 http://wiki.dreamhost.com/Associate_an_Email_Address_with_a_User_with_Shell_Privileges (points to the page above)
 http://wiki.dreamhost.com/Email_to_Script (obsolete)