I've removed mailpolice.com from the main code and I've published instructions for cleaning current installations, this morning, as soon as one of my clients contacted me with the problem (and before I even worked on my own systems).
I try hard to maintain the blocklists, but unless one of the spam lists makes an announcement (this morning when I did the work I didn't see one; if you did, let me know and I'll subscribe) it's not easy for me to catch.
@daveyw, and others:
I haven't figured out an easy way to check, especially not in the exim.conf file.
Perhaps counting the number of daily hits on each blocklist we use (easy enough with the rejectlog file) and then if the numbers go drastically higher, send an email?
For what it's worth, if you write my support email address (figure it out; I'm not posting it here
it rings a bell in my home office. Hopefully if I'm home I'll hear it even if I'm not at my computer.
I give my contract clients ways to reach me 24/7.
I do what I can.
And I still recommend blocklists in spite of issues such as these.
Jeff