I've been using Spam Assassin for a year or two with good results, but lately more spam is making it past Spam Assassin's filters. I read in the SA documentation that you can update the program's files using sa-update or by getting updates from razor. How do I do that? (I also read that you can teach your own implementation of SA by showing it files of your spam, but that seems too complicated, I'd rather just get an update from a central source.)

thanks