Fix postfix on ubuntu server to work with comcast

I need somebody to fix my postfix install on my ubuntu server. I have a couple issues. 1 = My internet service provider is comcast and my ip address is on a blacklist ([login to view URL]) so I want to send my mail to comcast as a relay server. 2 = There is a problem with my certificates for some reason it doesnt like comcast cerificate (read errors below) The output from my mail log is attached. I need somebody who has had to address this problem with this isp in particular. I also need this job done within 24 hours. YOU MUST ADDRESS MY SITUATION IN YOUR BID OR YOU WILL BE IGNORED. I will consider the problem finished when my configured PHP script can send an e-mail to my users and return no errors through comcast. I have already attempted to solve these problems and Im relatively close but dont have more time to spend on this. I expect to pay 30 dollars for this but an experienced and quick responding admin can recieve more for a quick delivery.