New comment moderation

I was away from the blog for 10 hours last night and this morning. In that time there were 67 comments here, all of them spam and all of them accompanied by an individual notification email. I don’t usually have 70 unread messages in my inbox in the morning, so one can imagine my surprise. None of the comments actually appeared here, I manually moderate most comments, but it was still a right royal pain. In response I’ve had to download some filtering software, but I don’t know how it will affect legitimate comments. It shouldn’t be a big problem, but if anyone has any problems commenting let me know via twitter, facebook or G+. (I assume everyone reading this has an account with at least one of those services.)