managing spam

[John Smith]

I'm getting a ton of spam recently; 50+ messages in one day. At first it
was just 2 or 3 per day, and I setup a few kolab filters to handle it based
on subject or sender, a bit of a pain but doable.

Then I tested a new email client called "Geary" and the thing just nicely
downloads all images it finds in the email; yeah at that point the spammers
got their "this user exists and read the email" notification due to the
image hit on their server and I suddenly (next day) got dumped on and it
hasn't let up.

So what are my options? I can't manage this via server filters anymore
because each subject / sender / ip address is different.

Is there not a way to say to kolab: "if sender is in addressbook, move
email to folder X"?

What about an easy way to run spam detection on my server; it's stock cent
os with just kolab 3 installed. I took a peek once at installing a spam
detection engine into kolab but my eyes sort of glazed over when I read the
massive page of instructions. Just getting kolab installed was nightmare
itself, don't want to take a chance of messing something up now that it's
all working.

Am I out of luck?
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