Hello,
I am doing PMTA server setups from 5 years. I do atleast 3 or 4 servers every week. I understand PowerMTA and IP throttling inside out.
I have a special default ISP configuration for PowerMTA that works very well for throttling.
I have also mastered the art of traffic shaping with PMTA. We have been successfully able to deliver 10 to 15 million emails per day using PMTA on different servers.
I can also create SPF/DKIM using PMTA in less than 5 minutes.
We can setup a server with multiple IPs and PMTA on it in less than 24 hours for you.
Please PM me so that we can open floor for discussion.