[exim] What's up ith the uceprotect blacklist?

I'm having problems with my spam filtering servers getting listed on
UCEPROTECT and can't figure out why. Is anyone familiar with how this
blacklist works and what I need to do to not get listed?

They seem to hate sender verification - but I'm not going to give that
up. What do I need to block to make my servers not show up on their
list? This is getting to be more than annoying. What domains do they
control so I can not trigger them?

Anyone else having this problem?