If you've been getting a whole bunch of spam in the last few days relayed from Livejournal's servers, it's because they decided to turn off all their damned spam filters. And call it a "feature". The fix for this is to completely disable your useless @livejournal.com email address. But this doesn't have a preferences checkbox, so it requires some Admin Console hoop-jumping. This won't affect comment emails.

Update: Ok, lisa says they didn't actually change anything about the filtering they do. But, I started getting relayed spam a few days ago that I never got before, and turning off the @livejournal.com address will presumably fix that, since I never used that address anyway.