Email Sending Software

I need somebody to build a mass email sending software. There are many products available on the market currently, but I would like one with these options added: 1. The email sending program must be able to switch "sent from" address at any given interval of emails. (Change "sent from" every 25 emails sent, or every 100 emails, user defined) 2. The program must be able to switch IP addresses via proxy at user defined intervals (switch IP every 25 emails, or every 100 emails) 3. Send directly or with SMPT.