DieOnSpam - yet another anti spam plugin
At my hebrew blog I use Akismet as my anti-spam utility. Akismet works very well in identifying spam, and has a low ratio of false positives. The problem with Akismet is that because of the false positives you have to check all the comments marked as spam by it. In bad spam days there can be many comments to inspect which is annoying by itself.
I have made some research into other anti-spam technologies, starting with renaming the php file which handles commenting and ending with the spamkarma2 plugin which is supposed to end all spam. Somewere in the research process I had realized a very basic fact of spam. All of the spam is in english. Since my blog is in hebrew and all the comments to the blog are in hebrew as well, it was only the logical thing to do to develope a plugin which blocks comments which are written entirely in english.
The plugin inspects the commited comment, and if the comment do not contain at least one non english character, it is assumed to be spam and is entirely ignored, and a message is returned to the user (in the rare case it is not a spam bot) which says that there has to be at least one non english character at the comment.
I have no idea if this logic can be applied to other Latin languages which have a common character set with english.
There is a newer version 2.0 right over here.