phpmail3 modifications

We have a licensed copy of phpmail3 latest version. We need debugging and additional features to be implemented to this package. The additional features needed are :- 1. The mail coming in for a user is picked up from the Catch all account and parsed for each user. If Challenge response system is activated by the user and the mail id from where the mail is coming in is not in the white list of the challenge response system the mail goes into a table of mysql pending verification. THe challenger response system sends a mail to the sender with a link which has captcha where the sender has to verify himself as a human being by visitng the link and entering the captcha numbers. We want to display all these mails pending verification in the inbox of each user with all functionalities of the inbox. So basically the inbox script / functions need to be copied and another link needs to created which will display all the mails. Also a script to transfer the mail to the inbox or marking the mail as not spam which will basically shift the mail from the Pending verification box to the inbox and also add the sender;s mail id to the challenge response system white list. 2. The second modification required is the following:- The challenge response system works automatically when mails are being downloaded from the POP accounts or the catch all accounts. Meaning verification mails are sent to all incoming mails. We want verificaiton mails to be sent only after the mails are checked for black listed words like sex or viagra. Mails with black listed words need not be sent a verification mail and can be shifted to the spam folder of the user automatically. The black listed words are the global filters or words set up by the admin. There are many other similar modifications needed. Please quote for the above work initially.