I need to do a proper write up somewhere that explains what we've done
steve1 - As per the replies, you see there are options above using Custom Filters. The idea is now though that AutoDelete (found under Settings >> Spam Tools >> Spam Ratings) isn't per Spam Tool anymore, it's based on the final outcome of the email.
Let's expand on that.....
One of the biggest changes between the old version and the new is the way in which emails are processed to their final outcome. In the old version it was managed by a complicated system of rules, and each tool (Filters, DNSBLs, Friends Lists) would have its own order of precedence.
So for example, in old MailWasher if the sender was in your Friends List then the email was always considered good, though you could write a filter to take precedence over this. Even if the Bayesian, DNSBL and FirstAlert thought that email was spam, it would always be good.
That works fine until you get into more complicated situations, such as spoofed senders to match the users own address, spam from infected contacts and so on. We decided to try a shift away from complicated rules based system and instead move into weighing tools together.
Each Spam Tool now applies it's own weight to the email, 0 is the mid point so considered neutral, a negative number is spammy and a positive number is good. The higher the number away from 0 the more likely it is to be spam or good. If the final result is between 0 and -/+50 MailWasher treats the email as unknown, that is to say, it might be good or bad, MailWasher doesn't know for sure.
So case in point, the email starts at 0, and matches your Blacklist, this applies a weight of -50 which makes the email spam,
You can of course, alter the weights yourself. So if you want a Blacklisted email to be treated more aggressively then under Settings >> Spam Tools >> Spam Ratings >> move the slider across to -200. That pretty much means any email from a Blacklisted sender would be spam unless a number of other sources said otherwise.
You can then enable AutoDelete for anything that scores larger than -200
A situation where this would not delete automatically, is if the Bayesian thought the email was good, but the sender was blacklisted. As you can see this causes a conflict, and the final weight of the email would likely end up less than -200 and not be deleted automatically. However I'm inclined to think this a good thing, as it helps protect against any erroneous blacklisting.
I only just woke up from a nap, so I hope this makes sense