> 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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