In the week since I switched this new blogging system on, I've had more than fifty trackback spams ... and no genuine trackbacks at all. So I'm switching trackbacks off completely. (I'll review this decision in a few weeks time, but right now I don't see why I should enable a feature which seems to only be used by spammers. Even though the built-in spam filtering caught all of them, I can't be arsed riding herd on it.)
Interestingly, there have been no attempts at comment spamming — or none that have got through the various spam detector plugins I've installed.
Meanwhile, my email continues to attract 300-500 spams per day, and a total of 2-3000 per day for all ten or so users on my server.