Hide my IP

I have my own mailer mounted on unix and have configured it with rotaing proxy ip's. I now need a script to hide my server url and ip. I have a large list and the majority of isp's only allow you to send 100 emails/hr. I cannot properly service my clients any more and even though I am sending different info to different people the isp's see all of my mail sent and think I am spamming. That is why I need to hide my server url and ip. If you can do this job reasonably and assure me the server url and ip will be invisible to all isp's then please provide me with the following: 1. estimated time to complete the job. 2. full cost to complete the job. 3. warranty of workmanship.