I too have had issues with that particular blacklist, which, I believe, is gaining notoriety as a scam. In my case I was setting up outgoing email for a custome

I too have had issues with that particular blacklist, which, I believe, is gaining notoriety as a scam. In my case I was setting up outgoing email for a customer's WordPress website. In the end, rather than spending the time and money dealing with the blacklist, we routed their mail through Sendgrid. Not an especially happy ending, but their email works now.