> In the past, I've found them to be totally unresponsive and gave up on > them.
That can't be right. I literally contacted them a few days ago and had a successful response (unlisting) within minutes during US business hours. Go here, put in your IP address, and they give you an opportunity to input a text description about the issue. https://ipcheck.proofpoint.com/ Note, they may not contact you, they did not contact me, but they did read what I wrote to them and they removed their listing of my IP address. I would add as a further point, it's up to you to make certain that your IP is clean before you ask them to unblock it. Put your IP(s) in https://multirbl.valli.org/ and see what lots of folks think about it. -Jim P.
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