Python Mail Script *Powerful and Fast*

I'm looking for a Powerful and fast Python mail script to be created and implemented with mass mailing OPT-IN emails. Proxies need to be used as the main header IP keeping my server away from being blacklisted and hiding its IP without falsifying the headers. Key element is being able to change Headers IP with ones provided from a url or txt file of some soft. I would like source code aswell to make any changes later on or add fucntions. Give me an idea on the price of this project please...