IMO, UCEPROTECTL3 is a scam and it's not worth even acknowledging their existence. https://www.reddit.com/r/sysadmin/comments/eur4ju/removal_fr... among many other similar posts.

https://www.uceprotect.net/en/index.php?m=7&s=8 -- "pay us to fix a problem that we've caused, and if you have the gall to call it what it is (extortion), then we'll publish your email and be massive dicks about it"

(To be clear, not all spam blacklists are scams - just UCEPROTECTL3 specifically)