529386 Build a PHP function that fetch and edit email subjects

We are in a need a PHP function that uses two inputs: email address and password to the mailbox to fetch, add keywords to the subject and then forward the email to a new address without making any changes what so ever the mail body. Both the changes that needs to be done to the subject and the new recipient may differ depending of the origin of the email and the rules that is to be used is currently located in a mysql db. The mail server where the mail should be fetched is static. Cheers. --Tony Johansson