This is fairly tough situation to deal with, and UCEPROTECT touches on it specifically:
https://www.uceprotect.net/en/index.php?m=7&s=0
Quote:
If the netblock with your IP address inside is listed as Level 2 or your provider is listed at Level 3, and you do not own the complete IP block or you are not the provider itself, this is a good indicator that you are an innocent user. This means that other customers of your service provider, or even your service provider themselves, caused that listing by regular abuse.
You NEVER sent spam? - Your system was NEVER an OPEN RELAY or an OPEN PROXY? Your system was never infected by viruses / worms???
This means your service provider’s netblock is blacklisted because someone else abused it for spamming or for the spreading viruses / worms in recent days!!!
It makes no sense for you to try to fix your service provider’s problems.
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That sounds like the situation you're in, right?
I was able to rectify a similar situation for a client by asking the host to communicate directly with the RBL. I explained everything that they had to do, and surprisingly, they had it resolved in a reasonable amount of time. I am not sure if they used the contact form, but that's a dangerous game to play. Being the host itself though, that gives you a lot more credibility than a client.
For UCEPROTECT, they've laid out the steps you take, and yeah, they're pretty strict. Other RBLs are easier to work with, and I've had good luck just emailing them and explaining the situation on behalf of my clients without the host needing to be part of the conversation. YMMV.
This is what I saw with UCEPROTECT:
https://www.uceprotect.net/en/index.php?m=8&s=0
Quote:
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Should you want to contact us, you should keep this in mind and behave rationally and calmly in order not to aggravate your situation.
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Leads you to:
https://www.uceprotect.net/en/index.php?m=7&s=7
or
https://www.uceprotect.net/en/index.php?m=7&s=8
This gets you here:
https://www.uceprotect.net/en/rblcheck.php
Please note this page:
https://www.uceprotect.net/en/index.php?m=4&s=0
The rblcheck page should provide context on how to get unflagged, but, again, by association, this is a huge problem because you're sharing the entire IP block with others and these RBLs do not care about your personal situation. It's important whether you're in 2 or 3, or both. You have to read every line they've written because they expect that.
When it came to mailers for my clients, and this happened, I really had no choice but to reissue a new dedicated IP address. Since then, I've had good luck by combining an existing MTA who is "okay" with adult content, and self-hosting software that can use that MTA to send emails out. Luckily, even on shared IP pools, this hasn't been an issue.